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k in (-oo:+oo)
2*(7*k+3) = 48 // - 48
2*(7*k+3)-48 = 0
2*(7*k+3)-48 = 0
14*k-42 = 0
14*k-42 = 0
14*k-42 = 0 // + 42
14*k = 42 // : 14
k = 42/14
k = 3
k = 3
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