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a-b=28
a = 28+b
(28+b)/b = 4/3
4b = 3(28+b)
4b = 84 +3b
b = 84
a = 28+84 = 112
a - b = 28
a = 4b ÷ 3
4b ÷ 3 - b = 28 /×3
a = 4b ÷ 3
4b - 3b = 84
a = 4b ÷ 3
b = 84
a = 112
b = 84