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x+x+1.25x=144
We move all terms to the left:
x+x+1.25x-(144)=0
We add all the numbers together, and all the variables
3.25x-144=0
We move all terms containing x to the left, all other terms to the right
3.25x=144
x=144/3.25
x=44+1/3.25
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