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 = (-1/5)*x // - (-1/5)*x
y-((-1/5)*x) = 0
(1/5)*x+y = 0
1/5*x+y = 0 // - y
1/5*x = -y // : 1/5
x = -y/1/5
x = -5*y
x = -5*y
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