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x+3x=3.2
We move all terms to the left:
x+3x-(3.2)=0
We add all the numbers together, and all the variables
4x-3.2=0
We move all terms containing x to the left, all other terms to the right
4x=3.2
x=3.2/4
x=2.66666666667/3.33333333333
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