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a in (-oo:+oo)
3*a-(5*a)-2 = -1/2 // + -1/2
3*a-(5*a)-(-1/2)-2 = 0
3*a-5*a+1/2-2 = 0
-2*a-3/2 = 0 // + 3/2
-2*a = 3/2 // : -2
a = 3/2/(-2)
a = -3/4
a = -3/4
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