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x in (-oo:+oo)
(1/2)*(x+150) = 350 // - 350
(1/2)*(x+150)-350 = 0
1/2*(x+150)-350 = 0
1/2*(x+150)-350 = 0
1/2*x-275 = 0
1/2*x-275 = 0
1/2*x-275 = 0 // + 275
1/2*x = 275 // : 1/2
x = 275/1/2
x = 550
x = 550
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