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x in (-oo:+oo)
(x+1)/2 = 0.6 // - 0.6
(x+1)/2-0.6 = 0
(x+1)/2+(-0.6*2)/2 = 0
x-0.6*2+1 = 0
x-0.2 = 0
(x-0.2)/2 = 0
(x-0.2)/2 = 0 // * 2
x-0.2 = 0
x-0.2 = 0 // + 0.2
x = 0.2
x = 0.2
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