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64=5z+21
We move all terms to the left:
64-(5z+21)=0
We get rid of parentheses
-5z-21+64=0
We add all the numbers together, and all the variables
-5z+43=0
We move all terms containing z to the left, all other terms to the right
-5z=-43
z=-43/-5
z=8+3/5
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