80=5u+15

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Solution for 80=5u+15 equation: 



80=5u+15

We move all terms to the left:

80-(5u+15)=0

We get rid of parentheses

-5u-15+80=0

We add all the numbers together, and all the variables

-5u+65=0

We move all terms containing u to the left, all other terms to the right

-5u=-65

u=-65/-5

u=+13

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