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-2z+7=42+3z=-5
We move all terms to the left:
-2z+7-(42+3z)=0
We add all the numbers together, and all the variables
-2z-(3z+42)+7=0
We get rid of parentheses
-2z-3z-42+7=0
We add all the numbers together, and all the variables
-5z-35=0
We move all terms containing z to the left, all other terms to the right
-5z=35
z=35/-5
z=-7
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