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r in (-oo:+oo)
(1/7)*(48*r-70) = 25 // - 25
(1/7)*(48*r-70)-25 = 0
1/7*(48*r-70)-25 = 0
1/7*(48*r-70)-25 = 0
48/7*r-35 = 0
48/7*r-35 = 0
48/7*r-35 = 0 // + 35
48/7*r = 35 // : 48/7
r = 35/48/7
r = 245/48
r = 245/48
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