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a in (-oo:+oo)
4-(5*a) = 3/7 // - 3/7
4-(5*a)-(3/7) = 0
4-5*a-3/7 = 0
25/7-5*a = 0 // - 25/7
-5*a = -25/7 // : -5
a = -25/7/(-5)
a = 5/7
a = 5/7
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