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y in (-oo:+oo)
12*y-(9/10) = y // - y
12*y-y-(9/10) = 0
12*y-y-9/10 = 0
11*y-9/10 = 0 // + 9/10
11*y = 9/10 // : 11
y = 9/10/11
y = 9/110
y = 9/110
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