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950=40x+3(20x)+6(15x)
We move all terms to the left:
950-(40x+3(20x)+6(15x))=0
We add all the numbers together, and all the variables
-(+975x)+950=0
We get rid of parentheses
-975x+950=0
We move all terms containing x to the left, all other terms to the right
-975x=-950
x=-950/-975
x=38/39
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