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n in (-oo:+oo)
7*(2*n-3) = 49 // - 49
7*(2*n-3)-49 = 0
7*(2*n-3)-49 = 0
14*n-70 = 0
14*n-70 = 0
14*n-70 = 0 // + 70
14*n = 70 // : 14
n = 70/14
n = 5
n = 5
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