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x=1*3
x=3
c) 3(x-5)=9
3x-15=9
3x=9+15
3x=24/:3
x=8
d) 4(x+1)=-84x+4=-8
4x=-8-4
4x=-12/:4
x=-3
a) x/5+8=20
1/5x=20-8
1/5x=12//:1/5
x=12*5
x=60