42=7x-21

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Solution for 42=7x-21 equation: 



42=7x-21

We move all terms to the left:

42-(7x-21)=0

We get rid of parentheses

-7x+21+42=0

We add all the numbers together, and all the variables

-7x+63=0

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

-7x=-63

x=-63/-7

x=+9

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