X-15=3x-57

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Solution for X-15=3x-57 equation: 



X-15=3X-57

We move all terms to the left:

X-15-(3X-57)=0

We get rid of parentheses

X-3X+57-15=0

We add all the numbers together, and all the variables

-2X+42=0

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

-2X=-42

X=-42/-2

X=+21

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