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x in (-oo:+oo)
y = (23/30)*x // - (23/30)*x
y-((23/30)*x) = 0
(-23/30)*x+y = 0
y-23/30*x = 0 // - y
-23/30*x = -y // : -23/30
x = -y/(-23/30)
x = 30/23*y
x = 30/23*y
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