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13z+2z+18=5z-12
We move all terms to the left:
13z+2z+18-(5z-12)=0
We add all the numbers together, and all the variables
15z-(5z-12)+18=0
We get rid of parentheses
15z-5z+12+18=0
We add all the numbers together, and all the variables
10z+30=0
We move all terms containing z to the left, all other terms to the right
10z=-30
z=-30/10
z=-3
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