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56=4z+12
We move all terms to the left:
56-(4z+12)=0
We get rid of parentheses
-4z-12+56=0
We add all the numbers together, and all the variables
-4z+44=0
We move all terms containing z to the left, all other terms to the right
-4z=-44
z=-44/-4
z=+11
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