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a in (-oo:+oo)
(3/5)*a-((1/2)*a) = 1/20 // - 1/20
(3/5)*a-((1/2)*a)-(1/20) = 0
(3/5)*a+(-1/2)*a-1/20 = 0
1/10*a-1/20 = 0 // + 1/20
1/10*a = 1/20 // : 1/10
a = 1/20/1/10
a = 1/2
a = 1/2
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