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5x-20-1.50x=40
We move all terms to the left:
5x-20-1.50x-(40)=0
We add all the numbers together, and all the variables
3.5x-60=0
We move all terms containing x to the left, all other terms to the right
3.5x=60
x=60/3.5
x=17+0.5/3.5
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