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a in (-oo:+oo)
(2/5)*a-6 = 3-(a/2) // - 3-(a/2)
(2/5)*a+a/2-6-3 = 0
9/10*a-9 = 0 // + 9
9/10*a = 9 // : 9/10
a = 9/9/10
a = 10
a = 10
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