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n in (-oo:+oo)
1/4-(7*n) = 225/4 // - 225/4
1/4-(7*n)-(225/4) = 0
1/4-7*n-225/4 = 0
-7*n-56 = 0 // + 56
-7*n = 56 // : -7
n = 56/(-7)
n = -8
n = -8
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