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2+3(4z-1)=-13
We move all terms to the left:
2+3(4z-1)-(-13)=0
We add all the numbers together, and all the variables
3(4z-1)+15=0
We multiply parentheses
12z-3+15=0
We add all the numbers together, and all the variables
12z+12=0
We move all terms containing z to the left, all other terms to the right
12z=-12
z=-12/12
z=-1
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