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12x-5x=50+6
7x=56 /:7
x=8
b) 2 (x-2)= 4x - 20
2x-4=4x-20
2x-4x=-20+4
-2x=-16 /: (-2)
x=8
c) 12x-7= 2(x-2)
12x-7=2x-4
12x-2x=-4+7
10x=3 /:10
x=0,3
d) 8x=80
8x=80 /:8
x=10