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A in (-oo:+oo)
A/5 = 2.2 // - 2.2
A/5-2.2 = 0
1/5*A-2.2 = 0 // + 2.2
1/5*A = 2.2 // : 1/5
A = 2.2/1/5
A = 11
A = 11
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