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450/15=x/20
We move all terms to the left:
450/15-(x/20)=0
We add all the numbers together, and all the variables
-(+x/20)+450/15=0
We add all the numbers together, and all the variables
-(+x/20)+30=0
We get rid of parentheses
-x/20+30=0
We multiply all the terms by the denominator
-x+30*20=0
We add all the numbers together, and all the variables
-1x+600=0
We move all terms containing x to the left, all other terms to the right
-x=-600
x=-600/-1
x=+600
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