What Is 7a plus 3 equals 21?

Anonymous

∙ 16y ago

Updated: 8/17/2019

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

Wiki User

∙ 16y ago

What else can I help you with?

7a plus 3 plus -a - 5 equals -16?

(7a=3)=(-a-5)=16

7a plus 4 equals 5a plus 7?

7a + 4 = 5a + 7 7a = 5a + 3 2a = 3 a = 3/2

What is the answer to A plus 18 equals 7a?

a + 18 = 7a a-a +18 = 7a-a 18 = 6a 18/6 = 6a/6 3 = a 3=a

How do you solve 11a plus 9 equals 4a plus 30?

11a+9 = 4a+30 11a-4a = 30-9 7a = 21 Solution: a = 3

What is the answer in 7(a plus 3)-c(a plus 3)?

Multiplying out the brackets it is: 7a+21-ac-3c

9a plus 15 equals 7a plus 9?

Collect like terms: 9a -7a = 9 - 15, ie 2a = -6, so a = -3

What is -7a plus 2a plus 9 equals 24?

-7a+2a+9 is also -5a+9. -5a+9=24. -5a=15. a=-3.

2a plus 5 a equals 3?

2a+5a=3 7a=3 a=3/7 or .4286

What is 7a plus 8b times 2 if a equals 3 and b equals 4?

7(3) + 8(4) x 2 21 + 32 x 2 43 x 2 86 The final answer is 86.

How do you expand and simplify 7 openbracket a plus 3 close bracket?

7(a + 3) = 7*a + 7*3 = 7a + 21

What is the variable for 8a-9 equals 7a-6?

The variable is a. You can solve for it, like this: 8a - 9 = 7a - 6 8a = 7a + 3 8a - 7a = 3 a = 3

What is the answer to C over 3 plus 4 equals 11?

The answer is 21 because if 21 is divided by 3 it equals 7 plus 4 equals 11.