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10-2x-3=0
7-2x=0
-2x=-7 //:(-2)
x=7/2
b)2(x-1)=x
2(x-1)-x=0
x-2=0
x=2
c)(x-7)-2(3x+5)=3
x-2(3x+5)-7-3=0
-5x-10-7-3=0
-5x-17-3=0
-5x-20=0
-5x=20 //:(-5)
x=-4