x+15=4x-42

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Solution for x+15=4x-42 equation: 



x+15=4x-42

We move all terms to the left:

x+15-(4x-42)=0

We get rid of parentheses

x-4x+42+15=0

We add all the numbers together, and all the variables

-3x+57=0

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

-3x=-57

x=-57/-3

x=+19

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