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a = 9.88 - 4.25
a = 5.63
a = 5.63
Given that 9.88 = 4.25 + a, we first subtract 4.25 from both sides to get:
9.88 - 4.25 = 4.25 + a - 4.25
5.63 = a
Therefore, a = 5.63.