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x in (-oo:+oo)
-2*x-(4/10) = 0
-2*x-2/5 = 0
-2*x-2/5 = 0 // + 2/5
-2*x = 2/5 // : -2
x = 2/5/(-2)
x = -1/5
x = -1/5
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