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x in (-oo:+oo)
-2*x = 3/20 // - 3/20
-2*x-(3/20) = 0
-2*x-3/20 = 0
-2*x-3/20 = 0 // + 3/20
-2*x = 3/20 // : -2
x = 3/20/(-2)
x = -3/40
x = -3/40
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