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5(9+z)=85
We move all terms to the left:
5(9+z)-(85)=0
We add all the numbers together, and all the variables
5(z+9)-85=0
We multiply parentheses
5z+45-85=0
We add all the numbers together, and all the variables
5z-40=0
We move all terms containing z to the left, all other terms to the right
5z=40
z=40/5
z=8
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