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-z+7=-2z+13
We move all terms to the left:
-z+7-(-2z+13)=0
We add all the numbers together, and all the variables
-1z-(-2z+13)+7=0
We get rid of parentheses
-1z+2z-13+7=0
We add all the numbers together, and all the variables
z-6=0
We move all terms containing z to the left, all other terms to the right
z=6
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