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f in (-oo:+oo)
(3/4)*f+5 = -5 // + 5
(3/4)*f+5+5 = 0
3/4*f+10 = 0 // - 10
3/4*f = -10 // : 3/4
f = -10/3/4
f = -40/3
f = -40/3
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