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r in (-oo:+oo)
1/4-((2/4)*r) = (-3/4)*r // - (-3/4)*r
1/4-((2/4)*r)-((-3/4)*r) = 0
(-1/2)*r+(3/4)*r+1/4 = 0
1/4*r+1/4 = 0 // - 1/4
1/4*r = -1/4 // : 1/4
r = -1/4/1/4
r = -1
r = -1
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