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