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