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13.6=(x+2x+.75x)/3
We move all terms to the left:
13.6-((x+2x+.75x)/3)=0
We add all the numbers together, and all the variables
-((+3.75x)/3)+13.6=0
We multiply all the terms by the denominator
-((+3.75x)+(13.6)*3)=0
We calculate terms in parentheses: -((+3.75x)+(13.6)*3), so:We get rid of parentheses
(+3.75x)+(13.6)*3
We add all the numbers together, and all the variables
(+3.75x)+40.8
We get rid of parentheses
3.75x+40.8
Back to the equation:
-(3.75x+40.8)
-3.75x-40.8=0
We move all terms containing x to the left, all other terms to the right
-3.75x=40.8
x=40.8/-3.75
x=-10+1/1.13636363636
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