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5=7+z
We move all terms to the left:
5-(7+z)=0
We add all the numbers together, and all the variables
-(z+7)+5=0
We get rid of parentheses
-z-7+5=0
We add all the numbers together, and all the variables
-1z-2=0
We move all terms containing z to the left, all other terms to the right
-z=2
z=2/-1
z=-2
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