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0.80x+.50(18-x)=.10(99)
We simplify the equation to the form, which is simple to understand
0.80x+.50(18-x)=.10(99)
Reorder the terms in parentheses
0.80x+(+9-0.5x)=.10*(99)
Remove unnecessary parentheses
+ 0.80x+9-0.5x=+.10+*(+99+)
Reorder the terms in parentheses
0.80x+9-0.5x=+(+9.9)
Remove unnecessary parentheses
+ 0.80x+9-0.5x=+9.9
We move all terms containing x to the left and all other terms to the right.
+ 0.8x-0.5x=+9.9-9
We simplify left and right side of the equation.
+ 0.3x=0.9
We divide both sides of the equation by 0.3 to get x.
x=3
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