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61=4z+13
We move all terms to the left:
61-(4z+13)=0
We get rid of parentheses
-4z-13+61=0
We add all the numbers together, and all the variables
-4z+48=0
We move all terms containing z to the left, all other terms to the right
-4z=-48
z=-48/-4
z=+12
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