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4z+7=2z-11
We move all terms to the left:
4z+7-(2z-11)=0
We get rid of parentheses
4z-2z+11+7=0
We add all the numbers together, and all the variables
2z+18=0
We move all terms containing z to the left, all other terms to the right
2z=-18
z=-18/2
z=-9
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