If it's not what You are looking for type in the equation solver your own equation and let us solve it.
x in (-oo:+oo)
b = (1/2)*f*n // - (1/2)*f*n
b-((1/2)*f*n) = 0
b+(-1/2)*f*n = 0
b-1/2*f*n = 0
x naleu017Cy do R
x in (-oo:+oo)
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