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A in (-oo:+oo)
A+A+10 = 260/2 // - 260/2
A+A-(260/2)+10 = 0
A+A-130+10 = 0
2*A-120 = 0 // + 120
2*A = 120 // : 2
A = 120/2
A = 60
A = 60
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