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