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300=2x+0.5x+0.25x
We move all terms to the left:
300-(2x+0.5x+0.25x)=0
We add all the numbers together, and all the variables
-(+2.75x)+300=0
We get rid of parentheses
-2.75x+300=0
We move all terms containing x to the left, all other terms to the right
-2.75x=-300
x=-300/-2.75
x=109+0.25/2.75
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