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r in (-oo:+oo)
(1/4)*r+(1/2)*r-(1/16) = (1/2)*r // - (1/2)*r
(1/4)*r+(1/2)*r-((1/2)*r)-(1/16) = 0
(1/4)*r+(1/2)*r+(-1/2)*r-1/16 = 0
1/4*r-1/16 = 0 // + 1/16
1/4*r = 1/16 // : 1/4
r = 1/16/1/4
r = 1/4
r = 1/4
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