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x in (-oo:+oo)
x/2 = 20/10 // - 20/10
x/2-(20/10) = 0
x/2-2 = 0
1/2*x-2 = 0 // + 2
1/2*x = 2 // : 1/2
x = 2/1/2
x = 4
x = 4
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