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r in (-oo:+oo)
(7*r)/8 = (-15-10)/3 // - (-15-10)/3
(7*r)/8-((-15-10)/3) = 0
7/8*r+25/3 = 0 // - 25/3
7/8*r = -25/3 // : 7/8
r = -25/3/7/8
r = -200/21
r = -200/21
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