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k in (-oo:+oo)
3*(5-3*k) = -57 // + 57
3*(5-3*k)+57 = 0
3*(5-3*k)+57 = 0
72-9*k = 0
72-9*k = 0
72-9*k = 0 // - 72
-9*k = -72 // : -9
k = -72/(-9)
k = 8
k = 8
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