3-9x=-10x+21

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Solution for 3-9x=-10x+21 equation: 



3-9x=-10x+21

We move all terms to the left:

3-9x-(-10x+21)=0

We get rid of parentheses

-9x+10x-21+3=0

We add all the numbers together, and all the variables

x-18=0

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

x=18

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