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