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15z-48=2z+30
We move all terms to the left:
15z-48-(2z+30)=0
We get rid of parentheses
15z-2z-30-48=0
We add all the numbers together, and all the variables
13z-78=0
We move all terms containing z to the left, all other terms to the right
13z=78
z=78/13
z=6
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