x+3+12=2x+9

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Solution for x+3+12=2x+9 equation: 



x+3+12=2x+9

We move all terms to the left:

x+3+12-(2x+9)=0

We add all the numbers together, and all the variables

x-(2x+9)+15=0

We get rid of parentheses

x-2x-9+15=0

We add all the numbers together, and all the variables

-1x+6=0

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

-x=-6

x=-6/-1

x=+6

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