1)2x-7=7x
2) 3(2a-4)=5
3) 7(a-4)=0
4) 7(2x-4)=7x+1
5) 7a+4=5a-3
6) 2a-4=a+4
7) 5x-4=0
8) 5(7x-4)=10x
9)15(a-4)=15
10) 2(7x-1)=5
11) 5x-3=2x-4
12) 7x-3=4-4x
13) 2(x-5)=4x
14) -(x-4)=2x+3
15) 2(x-3)=4x
16) 2x-3=x+5
17) 4-2x=2x+5
18) 5a+4=a
19)7(2a-4)=5a
20) 4-2a=0
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1) 2x-7=7x
2x - 7x = 7
-5x = 7 /:(-5)
x = -1,4
2) 3(2a-4)=5
6a - 12 = 5
6x = 5 + 12
6x = 17 /:6
x = 17/6
3) 7(a-4)=0
7a - 28 = 0
7a = 28 /:7
a = 4
4) 7(2x-4)=7x+1
14x - 28 = 7x + 1
14x - 7x = 1 + 28
7x = 29 /:7
x = 29/7
5) 7a+4=5a-3
7a - 5a = -3 - 4
2a = -7 /:2
a = -3,5
6) 2a-4=a+4
2a - a = 4 + 4
a = 8
7) 5x-4=0
5x = 4 /:5
x = 0,8
8) 5(7x-4)=10x
35x - 20 = 10x
35x - 10x = 20
25x = 20 /:25
x = 0,8
9)15(a-4)=15
15a - 60 = 15
15a = 15 + 60
15a = 75 /:15
a = 5
10) 2(7x-1)=5
14x - 2 = 5
14x = 5 + 2
14x = 7 /:14
x = 0,5
11) 5x-3=2x-4
5x - 2x = -4 + 3
3x = -1 /:3
x = -1/3
12) 7x-3=4-4x
7x + 4x = 4 + 3
11x = 7 /:11
x = 7/11
13) 2(x-5)=4x
2x - 10 = 4x
2x - 4x = 10
-2x = 10 /:(-2)
x = -5
14) -(x-4)=2x+3
-x + 4 = 2x + 3
-x - 2x = 3 - 4
-3x = -1 /:(-3)
x = 1/3
15) 2(x-3)=4x
2x - 6 = 4x
2x - 4x = 6
-2x = 6 /:(-2)
x = -3
16) 2x-3=x+5
2x - x = 5 + 3
x = 8
17) 4-2x=2x+5
-2x - 2x = 5 - 4
-4x = 1 /:(-4)
x = -0,25
18) 5a+4=a
5a - a = -4
4a = -4 /:4
a = -1
19) 7(2a-4)=5a
14a - 28 = 5a
14a - 5a = 28
9a = 28 /:9
a = 28/9
20) 4-2a=0
-2a = -4 /:(-2)
a = 2