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x in (-oo:+oo)
x/2-10 = 1/2 // - 1/2
x/2-(1/2)-10 = 0
x/2-1/2-10 = 0
1/2*x-21/2 = 0 // + 21/2
1/2*x = 21/2 // : 1/2
x = 21/2/1/2
x = 21
x = 21
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