21+2x=12+5x

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Solution for 21+2x=12+5x equation: 



21+2x=12+5x

We move all terms to the left:

21+2x-(12+5x)=0

We add all the numbers together, and all the variables

2x-(5x+12)+21=0

We get rid of parentheses

2x-5x-12+21=0

We add all the numbers together, and all the variables

-3x+9=0

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

-3x=-9

x=-9/-3

x=+3

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