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 = (1/3)*x-9 // - (1/3)*x-9
y-((1/3)*x)+9 = 0
(-1/3)*x+y+9 = 0
y-1/3*x+9 = 0 // - y+9
-1/3*x = -(y+9) // : -1/3
x = (-(y+9))/(-1/3)
x = 3*(y+9)
x = 3*(y+9)
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