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80=x*300
We move all terms to the left:
80-(x*300)=0
We add all the numbers together, and all the variables
-(+x*300)+80=0
We get rid of parentheses
-x*300+80=0
Wy multiply elements
-300x+80=0
We move all terms containing x to the left, all other terms to the right
-300x=-80
x=-80/-300
x=4/15
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