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 = a-(b/a) // - a-(b/a)
b/a-a+x = 0
a^-1*b-a+x = 0 // - a^-1*b-a
x = -(a^-1*b-a)
x = a-(a^-1*b)
x = a-(a^-1*b)
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