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n in (-oo:+oo)
4*n+3 = 75-2*n // - 75-2*n
4*n-(-2*n)-75+3 = 0
4*n+2*n-75+3 = 0
6*n-72 = 0 // + 72
6*n = 72 // : 6
n = 72/6
n = 12
n = 12
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