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a in (-oo:+oo)
5*a-2 = -9/2 // + -9/2
5*a-(-9/2)-2 = 0
5*a+9/2-2 = 0
5*a+5/2 = 0 // - 5/2
5*a = -5/2 // : 5
a = -5/2/5
a = -1/2
a = -1/2
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