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-50=10z-15z
We move all terms to the left:
-50-(10z-15z)=0
We add all the numbers together, and all the variables
-(-5z)-50=0
We get rid of parentheses
5z-50=0
We move all terms containing z to the left, all other terms to the right
5z=50
z=50/5
z=10
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