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a in (-oo:+oo)
(2*a)/8 = 5/10 // - 5/10
(2*a)/8-(5/10) = 0
(2*a)/8-1/2 = 0
1/4*a-1/2 = 0 // + 1/2
1/4*a = 1/2 // : 1/4
a = 1/2/1/4
a = 2
a = 2
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