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n in (-oo:+oo)
1/2-7*n = -153/2 // + -153/2
1/2-7*n-(-153/2) = 0
1/2-7*n+153/2 = 0
77-7*n = 0 // - 77
-7*n = -77 // : -7
n = -77/(-7)
n = 11
n = 11
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