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f in (-oo:+oo)
7*(18/3) = 2*3*f // - 2*3*f
7*(18/3)-(2*3*f) = 0
7*(18/3)-6*f = 0
42-6*f = 0 // - 42
-6*f = -42 // : -6
f = -42/(-6)
f = 7
f = 7
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