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