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a in (-oo:+oo)
(7*a)/2 = 5*a-3 // - 5*a-3
(7*a)/2-(5*a)+3 = 0
(7*a)/2-5*a+3 = 0
3-3/2*a = 0 // - 3
-3/2*a = -3 // : -3/2
a = -3/(-3/2)
a = 2
a = 2
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