3+4x=-2x+21

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Solution for 3+4x=-2x+21 equation: 



3+4x=-2x+21

We move all terms to the left:

3+4x-(-2x+21)=0

We get rid of parentheses

4x+2x-21+3=0

We add all the numbers together, and all the variables

6x-18=0

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

6x=18

x=18/6

x=3

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