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a in (-oo:+oo)
2*a-(6/4) = -5 // + 5
2*a-(6/4)+5 = 0
2*a-3/2+5 = 0
2*a+7/2 = 0 // - 7/2
2*a = -7/2 // : 2
a = -7/2/2
a = -7/4
a = -7/4
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