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0.30x+.05(18-x)=.10(-31)
We simplify the equation to the form, which is simple to understand
0.30x+.05(18-x)=.10(-31)
Reorder the terms in parentheses
0.30x+( + 0.9-0.05x)=.10*(-31)
Remove unnecessary parentheses
+ 0.30x + 0.9-0.05x=+.10+*(-31+)
Reorder the terms in parentheses
0.30x + 0.9-0.05x=+(-3.1)
Remove unnecessary parentheses
+ 0.30x + 0.9-0.05x=-3.1
We move all terms containing x to the left and all other terms to the right.
+ 0.3x-0.05x=-3.1-0.9
We simplify left and right side of the equation.
+ 0.25x=-4
We divide both sides of the equation by 0.25 to get x.
x=-16
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