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cw.7
a(3(3-x)+2x=8-2(x-1)
b)4x+5-(3x+6)=2(2+x)-4
c)4-5(3-x)=-x-(3-2x)
d)x-(7+2x)=2(x-1)=1
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cw 7
a
3(3-x)+2x=8-2(x-1)
9-3x+2x=8-2x+2
-3x+2x+2x=8+2-9
x=1
b
4x+5-(3x+6)=2(2+x)-4
4x+5-3x-6=4+2x-4
4x-3x-2x=4-4-5+6
-x=1
x=-1
c
4-5(3-x)=-x-(3-2x)
4-15+5x=-x-3+2x
5x+x-2x=-3-2+15
4x=20
x=5
d
x-(7+2x)=2(x-1)+1
x-7-2x=2x-2+1
x-2x-2x=-2+1+7
-3x=6
x=-2
7.
a) 3(3-x) +2x = 8 -2(x-1)
9 - 3x +2x = 8 -2x +2
-3x +2x +2x = 8 +2 -9
x = 1
b) 4x +5 -(3x+6) = 2(2+x) -4
4x +5 -3x -6 = 4 +2x -4
4x -3x -2x = 4 -4 -5 +6
-x = 1 /*(-1)
x = -1
c) 4-5(3-x) = -x - (3-2x)
4 -15 +5x = -x -3 +2x
5x +x -2x = -3 -4 +15
4x = 8 /:4
x = 2
d) x -(7 +2x) = 2(x-1) +1
x -7 -2x = 2x -2 +1
x - 2x -2x = -2 +1 +7
-3x = 6 /:(-3)
x = -2
5.
a) 3(x-4) -4(2x -7) = 2(x+5)
3x -12 - 8x +28 = 2x +10
3x -8x -2x = 10 +12 -28
-7x = -6 /(-7)
x = 6/7
b) 2(2x-3) +3(4-x) = - (x+1)
4x -6 + 12 -3x = -x -1
4x -3x +x = -1 +6 -12
2x = -7/:2
x = -7/2
c) 2(x-3) -4(3+x)= -3(x+2) +2(2x-1)
2x -6 -12 -4x = -3x -6 +4x -2
2x -4x +3x -4x = -6 -2 +6 +12
-3x = 10 /(-3)
x = -10/3
d)6(x+1) +3(2-x) = 2(2x-1) -(4-x)
6x +6 +6 -3x = 4x -2 -4 +x
6x -3x -4x -x = -2 -4 -6 -6
-2x = -18 /: (-2)
x = 9
6.
a) 2(x-7) -3(x+2) = 4(x+3) +2(x-9)
2x -14 -3x -6 = 4x +12 +2x -18
2x -3x -4x -2x = 12 -18 +14 +6
-7x = 14 /: (-7)
x = -2
b) -3(x+6) -6(2x+8)= -2(4-x) +9(x+8)
-3x - 18 -12x -48 = -8 +2x+9x+72
-3x -12x -2x -9x = -8 +72 +18 +48
-26x = 130 /:(-26)
x = -5
c) -8(x+2) +3(x+5)= -2(2x +3) +4(2x -1)
-8x -16 +3x +15 = -4x -6 +8x -4
-8x +3x +4x -8x = -6 -4 +16 -15
-9x = -9 /:(-9)
x = 1
d) 6(4-x) +5(2x-5) = 4(x-1) -3(4-x)
24 -6x +10x -25 = 4x -4 -12 +3x
-6x +10x -4x -3x = -4 -12 -24 +25
-3x = -15 / :(-3)
x = 5