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n in (-oo:+oo)
(-4/5)*n = -7/9 // + -7/9
(-4/5)*n-(-7/9) = 0
(-4/5)*n+7/9 = 0
7/9-4/5*n = 0 // - 7/9
-4/5*n = -7/9 // : -4/5
n = -7/9/(-4/5)
n = 35/36
n = 35/36
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