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-30=-7z+3z-14
We move all terms to the left:
-30-(-7z+3z-14)=0
We add all the numbers together, and all the variables
-(-4z-14)-30=0
We get rid of parentheses
4z+14-30=0
We add all the numbers together, and all the variables
4z-16=0
We move all terms containing z to the left, all other terms to the right
4z=16
z=16/4
z=4
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