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x=1008
b) 3+x/3=4 /*3
9+x=12 /-9
x=3
c) 3(x-5)=9
3x-15=9 /+15
3x=24 /:3
x=8
d) 4(x+1)=-8
4x+4=-8 / -4
4x=-12 /:4
x=-3