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A - 10 = 2B - 20
A = 2B - 20 + 10
A = 2B - 10
2A = 4B - 20
(A + 5) = 3/2(B + 5)
A + 5 = 3/2B + 15/2
2A + 10 = 3B + 15
2A = 3B + 15 - 10
2A = 3B + 5
2A = 2A
4B - 20 = 3B + 5
4B - 3B = 5 + 20
B = 25
2A = 3B + 5
2A = 3(25) + 5
2A = 75 + 5
2A = 80
A = 80/2
A = 40