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n in (-oo:+oo)
73 = 3*n+7*n+3 // - 3*n+7*n+3
73-(3*n)-(7*n)-3 = 0
73-3*n-7*n-3 = 0
70-10*n = 0 // - 70
-10*n = -70 // : -10
n = -70/(-10)
n = 7
n = 7
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