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