42=50-x

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Solution for 42=50-x equation: 



42=50-x

We move all terms to the left:

42-(50-x)=0

We add all the numbers together, and all the variables

-(-1x+50)+42=0

We get rid of parentheses

1x-50+42=0

We add all the numbers together, and all the variables

x-8=0

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

x=8

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