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r in (-oo:+oo)
(1/5)*(r+6) = (-1/7)*(r+8) // - (-1/7)*(r+8)
(1/5)*(r+6)-((-1/7)*(r+8)) = 0
(1/5)*(r+6)+(1/7)*(r+8) = 0
1/5*(r+6)+1/7*(r+8) = 0
1/5*(r+6)+1/7*(r+8) = 0
12/35*r+82/35 = 0
12/35*r+82/35 = 0
12/35*r+82/35 = 0 // - 82/35
12/35*r = -82/35 // : 12/35
r = -82/35/12/35
r = -41/6
r = -41/6
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