21=-9x+3

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Solution for 21=-9x+3 equation: 



21=-9x+3

We move all terms to the left:

21-(-9x+3)=0

We get rid of parentheses

9x-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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