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k in (-oo:+oo)
4*(7-(5*k)) = -112 // + 112
4*(7-(5*k))+112 = 0
4*(7-5*k)+112 = 0
4*(7-5*k)+112 = 0
140-20*k = 0
140-20*k = 0
140-20*k = 0 // - 140
-20*k = -140 // : -20
k = -140/(-20)
k = 7
k = 7
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