Ask Me Help Desk - Solving equation with a letter in it

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Solving equation with a letter in it

Hello, so my teachers are still not clear on explaining things so i thought I'd ask here,

part of the equation is;
(20,000 x P) – [0.9*((20,000P)/0.7)] = blah blah blah

The problem is i cant figure out how to do the [0.9*((20,000P)/0.7)] Which is screwing up the whole question for me.

Starting with:

$20000P - 0.9 ( \frac {20000P}{0.7} )= X$

Note that the 20000P term can be factored out:

$20000P (1 - \frac {0.9}{0.7}) = X$

$20000P (-0.2857) = X$

$-5714 P = X$

$P = \frac {-X}{5714}$

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