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k in (-oo:+oo)
5*(7-(5*k)) = 135 // - 135
5*(7-(5*k))-135 = 0
5*(7-5*k)-135 = 0
5*(7-5*k)-135 = 0
-25*k-100 = 0
-25*k-100 = 0
-25*k-100 = 0 // + 100
-25*k = 100 // : -25
k = 100/(-25)
k = -4
k = -4
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