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15=3(z-13)
We move all terms to the left:
15-(3(z-13))=0
We calculate terms in parentheses: -(3(z-13)), so:We get rid of parentheses
3(z-13)
We multiply parentheses
3z-39
Back to the equation:
-(3z-39)
-3z+39+15=0
We add all the numbers together, and all the variables
-3z+54=0
We move all terms containing z to the left, all other terms to the right
-3z=-54
z=-54/-3
z=+18
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