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n in (-oo:+oo)
2*(5*n-1) = 48 // - 48
2*(5*n-1)-48 = 0
2*(5*n-1)-48 = 0
10*n-50 = 0
10*n-50 = 0
10*n-50 = 0 // + 50
10*n = 50 // : 10
n = 50/10
n = 5
n = 5
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