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r in (-oo:+oo)
(1/4)*(r+6) = (1/7)*(r+8) // - (1/7)*(r+8)
(1/4)*(r+6)-((1/7)*(r+8)) = 0
(1/4)*(r+6)+(-1/7)*(r+8) = 0
1/4*(r+6)-1/7*(r+8) = 0
1/4*(r+6)-1/7*(r+8) = 0
3/28*r+5/14 = 0
3/28*r+5/14 = 0
3/28*r+5/14 = 0 // - 5/14
3/28*r = -5/14 // : 3/28
r = -5/14/3/28
r = -10/3
r = -10/3
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