value of r when r+6/r+3=29700/p
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r+6/r+3 = 29700/p
p*(r+6) = 29700*(r+3)
rp+ 6p = 29700r + 89100
rp-29700r = 89100 - 6p
r(p-29700) = 6(14850-p)
r= 6(14850-p)/(p-29700)
p*(r+6) = 29700*(r+3)
rp+ 6p = 29700r + 89100
rp-29700r = 89100 - 6p
r(p-29700) = 6(14850-p)
r= 6(14850-p)/(p-29700)
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