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x+x*0.25=300
We move all terms to the left:
x+x*0.25-(300)=0
Wy multiply elements
x+0.25x-300=0
We add all the numbers together, and all the variables
1.25x-300=0
We move all terms containing x to the left, all other terms to the right
1.25x=300
x=300/1.25
x=240
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