What is the solution of 3 (4a + 2) = 2 (a - 2) ?

A. - 1

B. - 0.4

C. 0.4

D. 1

a = - 1 → A

distribute brackets on both sides of the equation

12a + 6 = 2a - 4 (subtract 2a from both sides)

12a - 2a + 6 = - 4

10a + 6 = - 4 (subtract 6 from both sides)

10a = - 4 - 6 = - 10 (divide both sides by 10)

a = - 1