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z-15=-5z+15
We move all terms to the left:
z-15-(-5z+15)=0
We get rid of parentheses
z+5z-15-15=0
We add all the numbers together, and all the variables
6z-30=0
We move all terms containing z to the left, all other terms to the right
6z=30
z=30/6
z=5
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