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.5x+.2(9-x)=4.05
We simplify the equation to the form, which is simple to understand
.5x+.2(9-x)=4.05
Reorder the terms in parentheses
.5x+(+1.8-0.2x)=4.05
Remove unnecessary parentheses
+.5x+1.8-0.2x=+4.05
We move all terms containing x to the left and all other terms to the right.
+ 0.5x-0.2x=+4.05-1.8
We simplify left and right side of the equation.
+ 0.3x=+2.25
We divide both sides of the equation by 0.3 to get x.
x=7.5
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