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)
x*(y/2) = 1 // - 1
x*(y/2)-1 = 0
1/2*x*y-1 = 0 // + 1
1/2*x*y = 1 // : 1/2*y
x = 1/(1/2*y)
x = 2*y^-1
x = 2*y^-1
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