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x in (-oo:+oo)
(1/2)*x = 0.8 // - 0.8
(1/2)*x-0.8 = 0
1/2*x-0.8 = 0 // + 0.8
1/2*x = 0.8 // : 1/2
x = 0.8/1/2
x = 1.6
x = 1.6
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