-3x=7x-21

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Solution for -3x=7x-21 equation: 



-3x=7x-21

We move all terms to the left:

-3x-(7x-21)=0

We get rid of parentheses

-3x-7x+21=0

We add all the numbers together, and all the variables

-10x+21=0

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

-10x=-21

x=-21/-10

x=2+1/10

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