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r in (-oo:+oo)
(3*(2*r-2))/7 = 3*r-(6/2) // - 3*r-(6/2)
(3*(2*r-2))/7-(3*r)+6/2 = 0
(3*(2*r-2))/7-3*r+6/2 = 0
(3*(2*r-2))/7-3*r+3 = 0
(3*(2*r-2))/7+(-3*7*r)/7+(3*7)/7 = 0
3*(2*r-2)-3*7*r+3*7 = 0
21-15*r-6 = 0
15-15*r = 0
(15-15*r)/7 = 0
(15-15*r)/7 = 0 // * 7
15-15*r = 0
15-15*r = 0 // - 15
-15*r = -15 // : -15
r = -15/(-15)
r = 1
r = 1
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