12 (3-2x) = 84 solve for x.

12 (3-2x) = 84

3-2x=84:12

3-2x=7

-2x=7-3

-2x=4

x=4: (-2)

x=-2

12 (3-2x) = 84

do distributive multiplication:

12 (3) + 12 (-2x) = 84

36 - 24x = 84

Deduct 36 to both sides

36 - 36 - 24x = 84 - 36

-24x = 48

divide - 24 to both sides

-24x / - 24 = 48/-24

x = - 2

To check:

12 (3-2x) = 84

12 (3-2 (-2) = 84

12 (3+4) = 84

12 (7) = 84

84 = 84