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n in (-oo:+oo)
(9*n)/35 = 36/49 // - 36/49
(9*n)/35-(36/49) = 0
(9*n)/35-36/49 = 0
9/35*n-36/49 = 0 // + 36/49
9/35*n = 36/49 // : 9/35
n = 36/49/9/35
n = 20/7
n = 20/7
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