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4z-12=-3z+37
We move all terms to the left:
4z-12-(-3z+37)=0
We get rid of parentheses
4z+3z-37-12=0
We add all the numbers together, and all the variables
7z-49=0
We move all terms containing z to the left, all other terms to the right
7z=49
z=49/7
z=7
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