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)
a-(k/g) = r+x // - r+x
a-(k/g)-r-x = 0
a-(g^-1*k)-r-x = 0 // - a-(g^-1*k)-r
-x = -(a-(g^-1*k)-r) // * -1
x = a-(g^-1*k)-r
x = a-(g^-1*k)-r
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