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k in (-oo:+oo)
7*k+2 = 3*k+34 // - 3*k+34
7*k-(3*k)-34+2 = 0
7*k-3*k-34+2 = 0
4*k-32 = 0 // + 32
4*k = 32 // : 4
k = 32/4
k = 8
k = 8
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