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