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k in (-oo:+oo)
2*(3-6*k) = 150 // - 150
2*(3-6*k)-150 = 0
2*(3-6*k)-150 = 0
-12*k-144 = 0
-12*k-144 = 0
-12*k-144 = 0 // + 144
-12*k = 144 // : -12
k = 144/(-12)
k = -12
k = -12
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