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54=5+7z
We move all terms to the left:
54-(5+7z)=0
We add all the numbers together, and all the variables
-(7z+5)+54=0
We get rid of parentheses
-7z-5+54=0
We add all the numbers together, and all the variables
-7z+49=0
We move all terms containing z to the left, all other terms to the right
-7z=-49
z=-49/-7
z=+7
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