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x+3x-2=12.6
We move all terms to the left:
x+3x-2-(12.6)=0
We add all the numbers together, and all the variables
4x-14.6=0
We move all terms containing x to the left, all other terms to the right
4x=14.6
x=14.6/4
x=3+1/1.53846153846
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