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 = (-5/8)*x // - (-5/8)*x
y-((-5/8)*x) = 0
(5/8)*x+y = 0
5/8*x+y = 0 // - y
5/8*x = -y // : 5/8
x = -y/5/8
x = -8/5*y
x = -8/5*y
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