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f in (-oo:+oo)
7-((1/16)*f) = -2 // + 2
2-((1/16)*f)+7 = 0
(-1/16)*f+2+7 = 0
9-1/16*f = 0 // - 9
-1/16*f = -9 // : -1/16
f = -9/(-1/16)
f = 144
f = 144
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