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2+x+3x=12+12x
We move all terms to the left:
2+x+3x-(12+12x)=0
We add all the numbers together, and all the variables
x+3x-(12x+12)+2=0
We add all the numbers together, and all the variables
4x-(12x+12)+2=0
We get rid of parentheses
4x-12x-12+2=0
We add all the numbers together, and all the variables
-8x-10=0
We move all terms containing x to the left, all other terms to the right
-8x=10
x=10/-8
x=-1+1/4
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