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a in (-oo:+oo)
a/5-(1/2) = -5 // + 5
a/5-(1/2)+5 = 0
a/5-1/2+5 = 0
1/5*a+9/2 = 0 // - 9/2
1/5*a = -9/2 // : 1/5
a = -9/2/1/5
a = -45/2
a = -45/2
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