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r in (-oo:+oo)
(2/7)*r+2*r = (1/2)*r+7/12 // - (1/2)*r+7/12
(2/7)*r+2*r-((1/2)*r)-(7/12) = 0
(2/7)*r+2*r+(-1/2)*r-7/12 = 0
25/14*r-7/12 = 0 // + 7/12
25/14*r = 7/12 // : 25/14
r = 7/12/25/14
r = 49/150
r = 49/150
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