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y in (-oo:+oo)
y/9 = 7/13 // - 7/13
y/9-(7/13) = 0
y/9-7/13 = 0
1/9*y-7/13 = 0 // + 7/13
1/9*y = 7/13 // : 1/9
y = 7/13/1/9
y = 63/13
y = 63/13
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