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3z+21+7z+51=2(-9z+50)
We move all terms to the left:
3z+21+7z+51-(2(-9z+50))=0
We add all the numbers together, and all the variables
10z-(2(-9z+50))+72=0
We calculate terms in parentheses: -(2(-9z+50)), so:We get rid of parentheses
2(-9z+50)
We multiply parentheses
-18z+100
Back to the equation:
-(-18z+100)
10z+18z-100+72=0
We add all the numbers together, and all the variables
28z-28=0
We move all terms containing z to the left, all other terms to the right
28z=28
z=28/28
z=1
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