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x in (-oo:+oo)
-2*y = 8*(5/6)*x // - 8*(5/6)*x
-(8*(5/6)*x)-2*y = 0
(-20/3)*x-2*y = 0
-20/3*x-2*y = 0 // + -2*y
-20/3*x = -(-2*y) // : -20/3
x = (-(-2*y))/(-20/3)
x = -3/10*y
x = -3/10*y
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