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