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20+2.75x=3.5
We move all terms to the left:
20+2.75x-(3.5)=0
We add all the numbers together, and all the variables
2.75x+16.5=0
We move all terms containing x to the left, all other terms to the right
2.75x=-16.5
x=-16.5/2.75
x=-6
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