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p+20-0.4p=28
We simplify the equation to the form, which is simple to understand
p+20-0.4p=28
We move all terms containing p to the left and all other terms to the right.
+1p-0.4p=+28-20
We simplify left and right side of the equation.
+ 0.6p=+8
We divide both sides of the equation by 0.6 to get p.
p=13.333333333333
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