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X*2+X=130
We move all terms to the left:
X*2+X-(130)=0
We add all the numbers together, and all the variables
X+X*2-130=0
Wy multiply elements
X+2X-130=0
We add all the numbers together, and all the variables
3X-130=0
We move all terms containing X to the left, all other terms to the right
3X=130
X=130/3
X=43+1/3
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