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3x-2x=1-7
x=-6
b) 10x - 20 = 4x - 20
10x-4x=-20+20
6x=0
x=0
c) 6x + 2x - 10 = 3x + 5
8x-3x=5+10
5x=15 /5
x=3
d) 12 - 4x + 8 = 8x + 2 - 3x
-4x-8x+3x=2-12-8
-9x=-18 /(-9)
x=2
e) 5 (x - 7) + 2 = -28
5x-35+2=-28
5x=-28+35-2
5x=5
x=1
f) 5 = 4 (x - 2) + 9
5=4x-8+9
-4x=-8+9-5
-4x=-4
x=1
g) 2 (x - 1) = 26 - 3 (x +1)
2x-2=26-3x-3
2x+3x=26-3+2
5x=25
x=5
h) 8x + 5 = 2 (4x + 2,5)
8x+5=8x+5
8x-8x=5-5
0=0
i) 4 ( 3 - x) = 20 + 7 (2 + x)
12-4x=20+14+7x
-4x-7x=20+14-12
-11x=22
x=-2