x+3+2x=5x-21

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Solution for x+3+2x=5x-21 equation: 



x+3+2x=5x-21

We move all terms to the left:

x+3+2x-(5x-21)=0

We add all the numbers together, and all the variables

3x-(5x-21)+3=0

We get rid of parentheses

3x-5x+21+3=0

We add all the numbers together, and all the variables

-2x+24=0

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

-2x=-24

x=-24/-2

x=+12

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