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n in (-oo:+oo)
83/4+72/5+63/5 = n+14 // - n+14
83/4-n+72/5+63/5-14 = 0
135/4-n = 0 // - 135/4
-n = -135/4 // * -1
n = 135/4
n = 135/4
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