42=x-15

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Solution for 42=x-15 equation: 



42=x-15

We move all terms to the left:

42-(x-15)=0

We get rid of parentheses

-x+15+42=0

We add all the numbers together, and all the variables

-1x+57=0

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

-x=-57

x=-57/-1

x=+57

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