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n in (-oo:+oo)
(-9*n)/4 = -7 // + 7
(-9*n)/4+7 = 0
7-9/4*n = 0 // - 7
-9/4*n = -7 // : -9/4
n = -7/(-9/4)
n = 28/9
n = 28/9
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