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x+1.5x=621.6
We move all terms to the left:
x+1.5x-(621.6)=0
We add all the numbers together, and all the variables
2.5x-621.6=0
We move all terms containing x to the left, all other terms to the right
2.5x=621.6
x=621.6/2.5
x=248+1/1.5625
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