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51=3(z+12)
We move all terms to the left:
51-(3(z+12))=0
We calculate terms in parentheses: -(3(z+12)), so:We get rid of parentheses
3(z+12)
We multiply parentheses
3z+36
Back to the equation:
-(3z+36)
-3z-36+51=0
We add all the numbers together, and all the variables
-3z+15=0
We move all terms containing z to the left, all other terms to the right
-3z=-15
z=-15/-3
z=+5
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