yes its really good better than average, the national curriculam is 5a so keep the good work!
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2a-6a+9-4a+9
6a + 9; a = 36a + 9= 6(3) + 9= 18 + 9= 27
6a+9
a + 6a - 9 = 30 7a - 9 = 30 7a = 30 + 9 7a = 39 a = 39/7 a = 5.571 (to 3 decimal places only).
usually 3rd or 4th grade.