solve the equation. a + 3(a - 1) = 3(2 + 1) enter the correct answer in the box.

Answer:

$a = 3$

Explanation:

Step1: Expand the equation

$a+3a - 3=3\times3$

Step2: Simplify the right - hand side

$a + 3a-3=9$

Step3: Combine like terms on the left - hand side

$4a-3 = 9$

Step4: Add 3 to both sides

$4a=9 + 3$ $4a=12$

Step5: Divide both sides by 4

$a=\frac{12}{4}$ $a = 3$