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(x+1.5x)12=621.6
We move all terms to the left:
(x+1.5x)12-(621.6)=0
We add all the numbers together, and all the variables
(+2.5x)12-(621.6)=0
We add all the numbers together, and all the variables
(+2.5x)12-621.6=0
We multiply parentheses
24x-621.6=0
We move all terms containing x to the left, all other terms to the right
24x=621.6
x=621.6/24
x=25+6/6.6666666666666
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