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x in (-oo:+oo)
40/1 = x/2 // - x/2
40/1-(x/2) = 0
40-(x/2) = 0
40-1/2*x = 0 // - 40
-1/2*x = -40 // : -1/2
x = -40/(-1/2)
x = 80
x = 80
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