42*7=x+15=57

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Solution for 42*7=x+15=57 equation: 



42*7=x+15=57

We move all terms to the left:

42*7-(x+15)=0

We add all the numbers together, and all the variables

-(x+15)+294=0

We get rid of parentheses

-x-15+294=0

We add all the numbers together, and all the variables

-1x+279=0

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

-x=-279

x=-279/-1

x=+279

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