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