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