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f in (-oo:+oo)
-((3/4)*f)-2 = -14 // + 14
14-((3/4)*f)-2 = 0
(-3/4)*f-2+14 = 0
12-3/4*f = 0 // - 12
-3/4*f = -12 // : -3/4
f = -12/(-3/4)
f = 16
f = 16
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