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x in (-oo:+oo)
-(2*x)-1/5 = 3/10 // - 3/10
-(2*x)-1/5-(3/10) = 0
-2*x-1/5-3/10 = 0
-2*x-1/2 = 0 // + 1/2
-2*x = 1/2 // : -2
x = 1/2/(-2)
x = -1/4
x = -1/4
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