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k in (-oo:+oo)
5*(3-4*k) = -145 // + 145
5*(3-4*k)+145 = 0
5*(3-4*k)+145 = 0
160-20*k = 0
160-20*k = 0
160-20*k = 0 // - 160
-20*k = -160 // : -20
k = -160/(-20)
k = 8
k = 8
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