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n in (-oo:+oo)
-40/45 = (-285*n)/45 // - (-285*n)/45
-((-285*n)/45)-40/45 = 0
(19/3)*n-40/45 = 0
19/3*n-8/9 = 0 // + 8/9
19/3*n = 8/9 // : 19/3
n = 8/9/19/3
n = 8/57
n = 8/57
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