x+3+2x=12

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



x+3+2x=12
We move all terms to the left:
x+3+2x-(12)=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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