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-3x-5=7x-6x+2
-3x-7x+6x=2+5
-4x=7 /:(-4)
x=-1,75
b) 6x-2(2x+1)=-2x+3
6x-4x-2=-2x+3
6x-4x+2x=3+2
4x=5 /:4
x=1,25