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x+3x=9.1
We move all terms to the left:
x+3x-(9.1)=0
We add all the numbers together, and all the variables
4x-9.1=0
We move all terms containing x to the left, all other terms to the right
4x=9.1
x=9.1/4
x=2+1/3.6363636363636
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