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4-15+5x=-x-3+2x
5x+x-2x=-3-4+15
4x=8/:4
x=2
b) 4x+5-(3x+6)=2(2+x)-4
4x+5-3x-6=4+2x-4
4x-3x-2x=4-4-5+6
-1x=1/:(-1)
x=-1
c) x-(7+2x)=2(x-1)+1
x-7-2x=2x-2+1
x-2x-2x=-2+1+7
-3x=6/:(-3)
x=-2