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r in (-oo:+oo)
(21/2)*r-(26/3) = 4*r+(5/2)*r-(8/3) // - 4*r+(5/2)*r-(8/3)
(21/2)*r-(4*r)-((5/2)*r)-(26/3)+8/3 = 0
(21/2)*r-4*r+(-5/2)*r-26/3+8/3 = 0
4*r-6 = 0 // + 6
4*r = 6 // : 4
r = 6/4
r = 3/2
r = 3/2
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