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