If it's not what You are looking for type in the equation solver your own equation and let us solve it.
y in (-oo:+oo)
y = 0.5*(3/4)^3 // - 0.5*(3/4)^3
y-(0.5*(3/4)^3) = 0
y-0.5*(3/4)^3 = 0
y-0.2109375 = 0 // + 0.2109375
y = 0.2109375
y = 0.2109375
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