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15z-18=13z+2
We move all terms to the left:
15z-18-(13z+2)=0
We get rid of parentheses
15z-13z-2-18=0
We add all the numbers together, and all the variables
2z-20=0
We move all terms containing z to the left, all other terms to the right
2z=20
z=20/2
z=10
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