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