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k in (-oo:+oo)
7*k+2/3 = 170/3 // - 170/3
7*k+2/3-(170/3) = 0
7*k+2/3-170/3 = 0
7*k-56 = 0 // + 56
7*k = 56 // : 7
k = 56/7
k = 8
k = 8
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