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2z+7=-7+4z
We move all terms to the left:
2z+7-(-7+4z)=0
We add all the numbers together, and all the variables
2z-(4z-7)+7=0
We get rid of parentheses
2z-4z+7+7=0
We add all the numbers together, and all the variables
-2z+14=0
We move all terms containing z to the left, all other terms to the right
-2z=-14
z=-14/-2
z=+7
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