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f in (-oo:+oo)
(-6/7)*f+18 = -12 // + 12
(-6/7)*f+12+18 = 0
30-6/7*f = 0 // - 30
-6/7*f = -30 // : -6/7
f = -30/(-6/7)
f = 35
f = 35
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