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r in (-oo:+oo)
(-2/7)*r+3/7 = 5 // - 5
(-2/7)*r+3/7-5 = 0
-2/7*r-32/7 = 0 // + 32/7
-2/7*r = 32/7 // : -2/7
r = 32/7/(-2/7)
r = -16
r = -16
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