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r in (-oo:+oo)
(-2/7)*r+2*r = (1/2)*r+7/2 // - (1/2)*r+7/2
(-2/7)*r+2*r-((1/2)*r)-(7/2) = 0
(-2/7)*r+2*r+(-1/2)*r-7/2 = 0
17/14*r-7/2 = 0 // + 7/2
17/14*r = 7/2 // : 17/14
r = 7/2/17/14
r = 49/17
r = 49/17
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