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12=30z-3
We move all terms to the left:
12-(30z-3)=0
We get rid of parentheses
-30z+3+12=0
We add all the numbers together, and all the variables
-30z+15=0
We move all terms containing z to the left, all other terms to the right
-30z=-15
z=-15/-30
z=1/2
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