21=-4x-3x

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Solution for 21=-4x-3x equation: 



21=-4x-3x

We move all terms to the left:

21-(-4x-3x)=0

We add all the numbers together, and all the variables

-(-7x)+21=0

We get rid of parentheses

7x+21=0

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

7x=-21

x=-21/7

x=-3

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