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x+x+0.5x+0.25x=99
We move all terms to the left:
x+x+0.5x+0.25x-(99)=0
We add all the numbers together, and all the variables
2.75x-99=0
We move all terms containing x to the left, all other terms to the right
2.75x=99
x=99/2.75
x=36
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