math
posted by Brennan .
(x3)/(6)(7)/(15)≤(3x1)/(10)

LCM(6,15,10) = 30, so if you multiply all the terms by 30, you get
5(x3)  2(7) <= 3(3x1)
5x314 <= 9x3
4x <= 14
x >= 7/2
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