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r in (-oo:+oo)
(-4/11)*r+2*r = (1/2)*r+25/2 // - (1/2)*r+25/2
(-4/11)*r+2*r-((1/2)*r)-(25/2) = 0
(-4/11)*r+2*r+(-1/2)*r-25/2 = 0
25/22*r-25/2 = 0 // + 25/2
25/22*r = 25/2 // : 25/22
r = 25/2/25/22
r = 11
r = 11
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