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3x+5x=15.2
We move all terms to the left:
3x+5x-(15.2)=0
We add all the numbers together, and all the variables
8x-15.2=0
We move all terms containing x to the left, all other terms to the right
8x=15.2
x=15.2/8
x=1+6/6.66666666667
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