Question

Solve: 3a - 15 = 6 a=

Answer 1

Answer: $a=7$

Reorder the terms

$-15 + 3a = 6$

Solving for variable 'a'.

Move all terms containing a to the left, all other terms to the right.

Add '15' to each side of the equation.

$-15 + 15 + 3a = 6 + 15$

Combine like terms: -15 + 15 = 0

$0 + 3a = 6 + 15\\3a = 6 + 15$

Combine like terms: 6 + 15 = 21

$3a = 21$

Divide each side by '3'.

$a = 7$

Answer 2

Answer:

a=7

Step-by-step explanation:

3a - 15 = 6

3a = 21 -> 6+15

21/3 = 7