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a in (-oo:+oo)
a+a/5-(1/2) = 10 // - 10
a+a/5-(1/2)-10 = 0
a+a/5-1/2-10 = 0
6/5*a-21/2 = 0 // + 21/2
6/5*a = 21/2 // : 6/5
a = 21/2/6/5
a = 35/4
a = 35/4
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