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A in (-oo:+oo)
A+2*A+(3/4)*A = 180 // - 180
A+2*A+(3/4)*A-180 = 0
15/4*A-180 = 0 // + 180
15/4*A = 180 // : 15/4
A = 180/15/4
A = 48
A = 48
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