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3x+13x=11.2
We move all terms to the left:
3x+13x-(11.2)=0
We add all the numbers together, and all the variables
16x-11.2=0
We move all terms containing x to the left, all other terms to the right
16x=11.2
x=11.2/16
x=9.33333333333/13.3333333333
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