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10z+5(z-12)=12
We move all terms to the left:
10z+5(z-12)-(12)=0
We multiply parentheses
10z+5z-60-12=0
We add all the numbers together, and all the variables
15z-72=0
We move all terms containing z to the left, all other terms to the right
15z=72
z=72/15
z=4+4/5
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