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-30-4z=7-2z
We move all terms to the left:
-30-4z-(7-2z)=0
We add all the numbers together, and all the variables
-4z-(-2z+7)-30=0
We get rid of parentheses
-4z+2z-7-30=0
We add all the numbers together, and all the variables
-2z-37=0
We move all terms containing z to the left, all other terms to the right
-2z=37
z=37/-2
z=-18+1/2
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