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x in (-oo:+oo)
28 = (1/2)*x+8 // - (1/2)*x+8
28-((1/2)*x)-8 = 0
(-1/2)*x-8+28 = 0
20-1/2*x = 0 // - 20
-1/2*x = -20 // : -1/2
x = -20/(-1/2)
x = 40
x = 40
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