Question 168650
{{{10p^2c^2 + 7pcr = 12r^2}}}    Solve for r
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{{{12r^2 - (7pc)r - 10p^2c^2 = 0}}}
Factor it
(4r - 5pc)*(3r + 2pc) = 0
r = 5pc/4
r = -2pc/3