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 = -2*(1/4)-1 // + -2*(1/4)-1
y-(-2*(1/4))+1 = 0
y+1/2+1 = 0
y+3/2 = 0 // - 3/2
y = -3/2
y = -3/2
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