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x(0.05)+(0.06)(7000-x)=400
We simplify the equation to the form, which is simple to understand
x(0.05)+(0.06)*(7000-x)=400
Reorder the terms in parentheses
+( + 0.05x)+(0.06)*(7000-x)=400
Remove unnecessary parentheses
+ 0.05x+( + 0.06+)+*(+7000-x+)=+400
Reorder the terms in parentheses
multiplication of parentheses
+ 0.05x+(+420-0.06x)=400
Remove unnecessary parentheses
+ 0.05x+420-0.06x=+400
We move all terms containing x to the left and all other terms to the right.
+ 0.05x-0.06x=+400-420
We simplify left and right side of the equation.
-0.01x=-20
We divide both sides of the equation by -0.01 to get x.
x=2000
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