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13=7-2z
We move all terms to the left:
13-(7-2z)=0
We add all the numbers together, and all the variables
-(-2z+7)+13=0
We get rid of parentheses
2z-7+13=0
We add all the numbers together, and all the variables
2z+6=0
We move all terms containing z to the left, all other terms to the right
2z=-6
z=-6/2
z=-3
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