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r in (-oo:+oo)
(-2/5)*r+2*r = (1/2)*r+11/2 // - (1/2)*r+11/2
(-2/5)*r+2*r-((1/2)*r)-(11/2) = 0
(-2/5)*r+2*r+(-1/2)*r-11/2 = 0
11/10*r-11/2 = 0 // + 11/2
11/10*r = 11/2 // : 11/10
r = 11/2/11/10
r = 5
r = 5
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