7x+42=21x+70

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Solution for 7x+42=21x+70 equation: 



7x+42=21x+70

We move all terms to the left:

7x+42-(21x+70)=0

We get rid of parentheses

7x-21x-70+42=0

We add all the numbers together, and all the variables

-14x-28=0

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

-14x=28

x=28/-14

x=-2

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