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f in (-oo:+oo)
(-2/3)*f+3 = -9 // + 9
(-2/3)*f+3+9 = 0
12-2/3*f = 0 // - 12
-2/3*f = -12 // : -2/3
f = -12/(-2/3)
f = 18
f = 18
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