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 = (-3/8)*x // - (-3/8)*x
y-((-3/8)*x) = 0
(3/8)*x+y = 0
3/8*x+y = 0 // - y
3/8*x = -y // : 3/8
x = -y/3/8
x = -8/3*y
x = -8/3*y
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