2x+3=21-4x

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



2x+3=21-4x

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

2x+4x-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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