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