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a in (-oo:+oo)
(3*a)/4-(a/5) = 11/2 // - 11/2
(3*a)/4-(a/5)-(11/2) = 0
(3*a)/4-(a/5)-11/2 = 0
11/20*a-11/2 = 0 // + 11/2
11/20*a = 11/2 // : 11/20
a = 11/2/11/20
a = 10
a = 10
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