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f in (-oo:+oo)
7*e-11 = f/8+13 // - f/8+13
7*e-(f/8)-13-11 = 0
7*e-1/8*f-24 = 0 // - 7*e-24
-1/8*f = -(7*e-24) // : -1/8
f = (-(7*e-24))/(-1/8)
f = -8*(24-(7*e))
f = -8*(24-(7*e))
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