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x in (-oo:+oo)
y = 2*(9/10)*x // - 2*(9/10)*x
y-(2*(9/10)*x) = 0
(-9/5)*x+y = 0
y-9/5*x = 0 // - y
-9/5*x = -y // : -9/5
x = -y/(-9/5)
x = 5/9*y
x = 5/9*y
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