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11z+7=12z+8
We move all terms to the left:
11z+7-(12z+8)=0
We get rid of parentheses
11z-12z-8+7=0
We add all the numbers together, and all the variables
-1z-1=0
We move all terms containing z to the left, all other terms to the right
-z=1
z=1/-1
z=-1
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