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3.5x+5x=15
We move all terms to the left:
3.5x+5x-(15)=0
We add all the numbers together, and all the variables
8.5x-15=0
We move all terms containing x to the left, all other terms to the right
8.5x=15
x=15/8.5
x=1+2.6/3.4
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