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y in (-oo:+oo)
(9/13)*y = 72/13 // - 72/13
(9/13)*y-(72/13) = 0
(9/13)*y-72/13 = 0
9/13*y-72/13 = 0 // + 72/13
9/13*y = 72/13 // : 9/13
y = 72/13/9/13
y = 8
y = 8
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