9a-a = 19+7a 8a = 19+7a 8a - 7a = 19 + 7a - 7a 1a = 19 a = 19
It is: 9a-a-a = 7a
9a + 1
2a+5a+9a = 16a
7a
The expression 2a - 9a is a subtraction problem involving two terms with the variable 'a'. To solve this, you need to combine the coefficients of 'a'. In this case, 2a - 9a simplifies to -7a. This is because you are subtracting 9a from 2a, which results in -7a.
a = 6b = 9a + b = 6 + 9 = 15
9a+21 3(3a+7)
12a + 6b + 9a + 14b =(12a + 9a) + (6b + 14b) =21a + 20b
-21 = 9a - 15 - 3a -6 = 6a -1 = a
-14 + 9a = 389a = 52a = 52/9 or 5.78
a= -0.8