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3.5x+3x=17.5
We move all terms to the left:
3.5x+3x-(17.5)=0
We add all the numbers together, and all the variables
6.5x-17.5=0
We move all terms containing x to the left, all other terms to the right
6.5x=17.5
x=17.5/6.5
x=2+1.8/2.6
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