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10(2.7z+5)=13
We move all terms to the left:
10(2.7z+5)-(13)=0
We multiply parentheses
20z+50-13=0
We add all the numbers together, and all the variables
20z+37=0
We move all terms containing z to the left, all other terms to the right
20z=-37
z=-37/20
z=-1+17/20
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