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2 b = 4 a + 7
b = 2 a + 3.5
b = 2 * 3 + 3.5 = 6 + 3.5 = 9.5
4a=2b-7
b = 2 a + 3.5
b = 2 * 3 + 3.5 = 6 + 3.5 = 9.5