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-3(z-4)-2(3z+1)=-8
We move all terms to the left:
-3(z-4)-2(3z+1)-(-8)=0
We add all the numbers together, and all the variables
-3(z-4)-2(3z+1)+8=0
We multiply parentheses
-3z-6z+12-2+8=0
We add all the numbers together, and all the variables
-9z+18=0
We move all terms containing z to the left, all other terms to the right
-9z=-18
z=-18/-9
z=+2
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