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A in (-oo:+oo)
(4*(5-A))/3 = -A // + A
(4*(5-A))/3+A = 0
(4*(5-A))/3+(3*A)/3 = 0
4*(5-A)+3*A = 0
20-A = 0
(20-A)/3 = 0
(20-A)/3 = 0 // * 3
20-A = 0
20-A = 0 // - 20
-A = -20 // * -1
A = 20
A = 20
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