If it's not what You are looking for type in the equation solver your own equation and let us solve it.
q in (-oo:+oo)
q = 0.5/0.25 // - 0.5/0.25
q-(0.5/0.25) = 0
q-2 = 0
q-2 = 0 // + 2
q = 2
q = 2
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