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