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