It's a simple linear equation in 'a'.
If you want to know the value of 'a' that makes the equation true,
you can find it as follows:
7a + 3 = 21
Subtract 3 from each side:
7a = 18
Divide each side by 7:
a = 18/7
(7a=3)=(-a-5)=16
7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2
a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a
Multiplying out the brackets it is: 7a+21-ac-3c
11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3
-7a+2a+9 is also -5a+9. -5a+9=24. -5a=15. a=-3.
Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3
2a+5a=3 7a=3 a=3/7 or .4286
7(3) + 8(4) x 2 21 + 32 x 2 43 x 2 86 The final answer is 86.
The variable is a. You can solve for it, like this: 8a - 9 = 7a - 6 8a = 7a + 3 8a - 7a = 3 a = 3
7(a + 3) = 7*a + 7*3 = 7a + 21
The answer is 21 because if 21 is divided by 3 it equals 7 plus 4 equals 11.