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n in (-oo:+oo)
7*(4*n-6) = 238 // - 238
7*(4*n-6)-238 = 0
7*(4*n-6)-238 = 0
28*n-280 = 0
28*n-280 = 0
28*n-280 = 0 // + 280
28*n = 280 // : 28
n = 280/28
n = 10
n = 10
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