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k in (-oo:+oo)
(1/2)*(k+150) = 275 // - 275
(1/2)*(k+150)-275 = 0
1/2*(k+150)-275 = 0
1/2*(k+150)-275 = 0
1/2*k-200 = 0
1/2*k-200 = 0
1/2*k-200 = 0 // + 200
1/2*k = 200 // : 1/2
k = 200/1/2
k = 400
k = 400
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