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n in (-oo:+oo)
-7*n-(2/9) = 425/72 // - 425/72
-7*n-(2/9)-(425/72) = 0
-7*n-2/9-425/72 = 0
-7*n-49/8 = 0 // + 49/8
-7*n = 49/8 // : -7
n = 49/8/(-7)
n = -7/8
n = -7/8
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