Question

c- 3 . (4x + 6) = 198

Answer 1

3 . (4x + 6) = 198
12x + 18 = 198 (Aplicamos distributiva)
12 x = 198 - 18
12 x = 180
x = 180 : 12
x =  15

Comprobamos:
3. (4x + 6) = 198
3 . (4 . 15 + 6) = 198
3 . (60 + 6) = 198
180 + 18 = 198 (Aplicamos distributiva)
198 = 198