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x in (-oo:+oo)
y = (11*x)/12 // - (11*x)/12
y-((11*x)/12) = 0
(-11/12)*x+y = 0
y-11/12*x = 0 // - y
-11/12*x = -y // : -11/12
x = -y/(-11/12)
x = 12/11*y
x = 12/11*y
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