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k in (-oo:+oo)
37 = 3*k+2*k+7 // - 3*k+2*k+7
37-(3*k)-(2*k)-7 = 0
37-3*k-2*k-7 = 0
30-5*k = 0 // - 30
-5*k = -30 // : -5
k = -30/(-5)
k = 6
k = 6
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