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r in (-oo:+oo)
(7*(2*r-2))/5 = 7*r-(6/3) // - 7*r-(6/3)
(7*(2*r-2))/5-(7*r)+6/3 = 0
(7*(2*r-2))/5-7*r+6/3 = 0
(7*(2*r-2))/5-7*r+2 = 0
(7*(2*r-2))/5+(-7*5*r)/5+(2*5)/5 = 0
7*(2*r-2)-7*5*r+2*5 = 0
10-21*r-14 = 0
-21*r-4 = 0
(-21*r-4)/5 = 0
(-21*r-4)/5 = 0 // * 5
-21*r-4 = 0
-21*r-4 = 0 // + 4
-21*r = 4 // : -21
r = 4/(-21)
r = -4/21
r = -4/21
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