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k in (-oo:+oo)
(2/3)*(k-80) = 52 // - 52
(2/3)*(k-80)-52 = 0
2/3*(k-80)-52 = 0
2/3*(k-80)-52 = 0
2/3*k-316/3 = 0
2/3*k-316/3 = 0
2/3*k-316/3 = 0 // + 316/3
2/3*k = 316/3 // : 2/3
k = 316/3/2/3
k = 158
k = 158
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