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