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31=-4(6z-3)
We move all terms to the left:
31-(-4(6z-3))=0
We calculate terms in parentheses: -(-4(6z-3)), so:We get rid of parentheses
-4(6z-3)
We multiply parentheses
-24z+12
Back to the equation:
-(-24z+12)
24z-12+31=0
We add all the numbers together, and all the variables
24z+19=0
We move all terms containing z to the left, all other terms to the right
24z=-19
z=-19/24
z=-19/24
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