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80=5(z+13)
We move all terms to the left:
80-(5(z+13))=0
We calculate terms in parentheses: -(5(z+13)), so:We get rid of parentheses
5(z+13)
We multiply parentheses
5z+65
Back to the equation:
-(5z+65)
-5z-65+80=0
We add all the numbers together, and all the variables
-5z+15=0
We move all terms containing z to the left, all other terms to the right
-5z=-15
z=-15/-5
z=+3
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