57=4u-15

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Solution for 57=4u-15 equation: 



57=4u-15

We move all terms to the left:

57-(4u-15)=0

We get rid of parentheses

-4u+15+57=0

We add all the numbers together, and all the variables

-4u+72=0

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

-4u=-72

u=-72/-4

u=+18

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