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a)
b)
c) 4(x + b) = 2b + c
4x + 4b = 2b + c
4x = 2b + c - 4b
4x = -2b + c
d)
1.
(x+a)/5 = b+1 I*5
x+a = 5(b+1)
x = 5(b+1)-a
==========
2.
1/2x+b = 3x-c
3x-c = 1/2x+b I*2
6x-2c = x+2b
6x-x = 2b+2c
5x = 2(b+c) /:5
x = 2(b+c)/5
===========
3.
4(x+b) = 2b+c
4x+4b = 2b+c
4x = 2b+c-4b
4x = c-2b /:4
x = (c-2b)/4
4.
7k-x = (x+b)/3 I*3
21k-3x = x+b
-3x-x = b-21k
-4x = b-21k /:(-4)
x = (21k-b)/4
============
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a)![\frac{x+a}{5}=b+1 \\ \\ x+a=5(b+1) \\ \\ x=5(b+1)-a \frac{x+a}{5}=b+1 \\ \\ x+a=5(b+1) \\ \\ x=5(b+1)-a](https://tex.z-dn.net/?f=%5Cfrac%7Bx%2Ba%7D%7B5%7D%3Db%2B1+%5C%5C+%5C%5C+x%2Ba%3D5%28b%2B1%29+%5C%5C+%5C%5C+x%3D5%28b%2B1%29-a)
b)![\frac{1}{2}x+b=3x-c \\ \\ b+c=3x-\frac{1}{2}x \\ \\ b+c = 2,5x \\ \\ x=\frac{b+c}{2,5} \frac{1}{2}x+b=3x-c \\ \\ b+c=3x-\frac{1}{2}x \\ \\ b+c = 2,5x \\ \\ x=\frac{b+c}{2,5}](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7Dx%2Bb%3D3x-c+%5C%5C+%5C%5C+b%2Bc%3D3x-%5Cfrac%7B1%7D%7B2%7Dx+%5C%5C+%5C%5C+b%2Bc+%3D+2%2C5x+%5C%5C+%5C%5C+x%3D%5Cfrac%7Bb%2Bc%7D%7B2%2C5%7D)
c) 4(x + b) = 2b + c
4x + 4b = 2b + c
4x = 2b + c - 4b
4x = -2b + c
d)![7k - x = \frac{x+b}{3} \\ \\ 21k-3x=x+b \\ \\ 21k-b=x+3x \\ \\ 4x=21k-b \\ \\ x=\frac{21k-b}{4} 7k - x = \frac{x+b}{3} \\ \\ 21k-3x=x+b \\ \\ 21k-b=x+3x \\ \\ 4x=21k-b \\ \\ x=\frac{21k-b}{4}](https://tex.z-dn.net/?f=7k+-+x+%3D+%5Cfrac%7Bx%2Bb%7D%7B3%7D+%5C%5C+%5C%5C+21k-3x%3Dx%2Bb+%5C%5C+%5C%5C+21k-b%3Dx%2B3x+%5C%5C+%5C%5C+4x%3D21k-b+%5C%5C+%5C%5C+x%3D%5Cfrac%7B21k-b%7D%7B4%7D)
1.
(x+a)/5 = b+1 I*5
x+a = 5(b+1)
x = 5(b+1)-a
==========
2.
1/2x+b = 3x-c
3x-c = 1/2x+b I*2
6x-2c = x+2b
6x-x = 2b+2c
5x = 2(b+c) /:5
x = 2(b+c)/5
===========
3.
4(x+b) = 2b+c
4x+4b = 2b+c
4x = 2b+c-4b
4x = c-2b /:4
x = (c-2b)/4
===========
4.
7k-x = (x+b)/3 I*3
21k-3x = x+b
-3x-x = b-21k
-4x = b-21k /:(-4)
x = (21k-b)/4
============