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280=.28(70+x)
We simplify the equation to the form, which is simple to understand
280=.28(70+x)
Reorder the terms in parentheses
280=+(+19.6 + 0.28x)
Remove unnecessary parentheses
+280=+19.6 + 0.28x
We move all terms containing x to the left and all other terms to the right.
-0.28x=+19.6-28-0
We simplify left and right side of the equation.
-0.28x=-8.4
We divide both sides of the equation by -00.28 to get x.
x=30
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