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a in (-oo:+oo)
a-(5/10) = 2*a-2.1 // - 2*a-2.1
a-(2*a)-(5/10)+2.1 = 0
a-2*a-1/2+2.1 = 0
1.6-a = 0 // - 1.6
-a = -1.6 // * -1
a = 1.6
a = 1.6
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