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-3z=15-4z
We move all terms to the left:
-3z-(15-4z)=0
We add all the numbers together, and all the variables
-3z-(-4z+15)=0
We get rid of parentheses
-3z+4z-15=0
We add all the numbers together, and all the variables
z-15=0
We move all terms containing z to the left, all other terms to the right
z=15
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