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6x-3(x+4)=12
6x-3x-12=12
3x=12+12
3x=24 /:3
x=8
b)
3/2(2-3x)=-6
6/2-9/2x=-6
-9/2x=-6-3
-9/2x=-9 /*(-2/9)
x=2
c)
5x-2(x+4)=10
5x-2x-8=10
3x=10+8
x=6
d)
2/5(3-x)=-2
6/5-2/5x=-2
-2/5x=-2-1i1/5
-2/5x=-3i1/5
-2/5x=-16/5 /*(-5/2)
x=-16/5*(-5/2)
x=8