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y in (-oo:+oo)
(12/22)*y = -18/22 // + -18/22
(12/22)*y-(-18/22) = 0
(12/22)*y+9/11 = 0
6/11*y+9/11 = 0 // - 9/11
6/11*y = -9/11 // : 6/11
y = -9/11/6/11
y = -3/2
y = -3/2
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