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k in (-oo:+oo)
4*(5-(4*k)) = 148 // - 148
4*(5-(4*k))-148 = 0
4*(5-4*k)-148 = 0
4*(5-4*k)-148 = 0
-16*k-128 = 0
-16*k-128 = 0
-16*k-128 = 0 // + 128
-16*k = 128 // : -16
k = 128/(-16)
k = -8
k = -8
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