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a = 3/(5-3) x 20 = 3/2 x 20 = 30
5A = 3B
A = 3B/5
MAKA, B-A = 20
B-3B/5 = 20
2B/5 = 20
2B = 20X5
B = 100/2
= 50
B-A = 20
50 -A = 20
-A = 20 - 50
-A = -30
A = 30