7x+21=-2x+3

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Solution for 7x+21=-2x+3 equation: 



7x+21=-2x+3

We move all terms to the left:

7x+21-(-2x+3)=0

We get rid of parentheses

7x+2x-3+21=0

We add all the numbers together, and all the variables

9x+18=0

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

9x=-18

x=-18/9

x=-2

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