(u-3)*8=80

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Solution for (u-3)*8=80 equation: 



(u-3)*8=80

We move all terms to the left:

(u-3)*8-(80)=0

We multiply parentheses

8u-24-80=0

We add all the numbers together, and all the variables

8u-104=0

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

8u=104

u=104/8

u=13

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