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x in (-oo:+oo)
y = (-10*x)/9 // - (-10*x)/9
y-((-10*x)/9) = 0
(10/9)*x+y = 0
10/9*x+y = 0 // - y
10/9*x = -y // : 10/9
x = -y/10/9
x = -9/10*y
x = -9/10*y
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