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20/20=x/280
We move all terms to the left:
20/20-(x/280)=0
We add all the numbers together, and all the variables
-(+x/280)+20/20=0
We add all the numbers together, and all the variables
-(+x/280)+1=0
We get rid of parentheses
-x/280+1=0
We multiply all the terms by the denominator
-x+1*280=0
We add all the numbers together, and all the variables
-1x+280=0
We move all terms containing x to the left, all other terms to the right
-x=-280
x=-280/-1
x=+280
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