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0.08x + 0.05(400-x)=0
We simplify the equation to the form, which is simple to understand
0.08x + 0.05(400-x)=0
Reorder the terms in parentheses
0.08x+(+20-0.05x)=0
Remove unnecessary parentheses
+ 0.08x+20-0.05x=0
We move all terms containing x to the left and all other terms to the right.
+ 0.08x-0.05x=0-20
We simplify left and right side of the equation.
+ 0.03x=-20
We divide both sides of the equation by 0.03 to get x.
x=-666.66666666667
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