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x in (-oo:+oo)
4*x = 8/4 // - 8/4
4*x-(8/4) = 0
4*x-2 = 0
4*x-2 = 0 // + 2
4*x = 2 // : 4
x = 2/4
x = 1/2
x = 1/2
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