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(1/2)*(x+150) = 275 // - 275
(1/2)*(x+150)-275 = 0
1/2*(x+150)-275 = 0
1/2*(x+150)-275 = 0
1/2*x-200 = 0
1/2*x-200 = 0
1/2*x-200 = 0 // + 200
1/2*x = 200 // : 1/2
x = 200/1/2
x = 400
x = 400
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