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a in (-oo:+oo)
3/2 = 7*a-(2*a)+3 // - 7*a-(2*a)+3
2*a-(7*a)+3/2-3 = 0
2*a-7*a+3/2-3 = 0
-5*a-3/2 = 0 // + 3/2
-5*a = 3/2 // : -5
a = 3/2/(-5)
a = -3/10
a = -3/10
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