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n in (-oo:+oo)
7*(3*n-5) = -203 // + 203
7*(3*n-5)+203 = 0
7*(3*n-5)+203 = 0
21*n+168 = 0
21*n+168 = 0
21*n+168 = 0 // - 168
21*n = -168 // : 21
n = -168/21
n = -8
n = -8
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