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r in (-oo:+oo)
(6*r-7)/(-10) = r/4 // - r/4
(6*r-7)/(-10)-(r/4) = 0
(6*r-7)/(-10)-r/4 = 0
(4*(6*r-7))/(-10*4)+(-10*(-r))/(-10*4) = 0
4*(6*r-7)-10*(-r) = 0
34*r-28 = 0
(34*r-28)/(-10*4) = 0
(34*r-28)/(-10*4) = 0 // * -10*4
34*r-28 = 0
34*r-28 = 0 // + 28
34*r = 28 // : 34
r = 28/34
r = 14/17
r = 14/17
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