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31-6z=-5(7z-3)
We move all terms to the left:
31-6z-(-5(7z-3))=0
We calculate terms in parentheses: -(-5(7z-3)), so:We get rid of parentheses
-5(7z-3)
We multiply parentheses
-35z+15
Back to the equation:
-(-35z+15)
-6z+35z-15+31=0
We add all the numbers together, and all the variables
29z+16=0
We move all terms containing z to the left, all other terms to the right
29z=-16
z=-16/29
z=-16/29
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