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0.12x + 0.15(700-x)=99
We simplify the equation to the form, which is simple to understand
0.12x + 0.15(700-x)=99
Reorder the terms in parentheses
0.12x+(+105-0.15x)=99
Remove unnecessary parentheses
+ 0.12x+105-0.15x=+99
We move all terms containing x to the left and all other terms to the right.
+ 0.12x-0.15x=+99-105
We simplify left and right side of the equation.
-0.03x=-6
We divide both sides of the equation by -0.03 to get x.
x=200
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