-18 - 6k = 6(1 + 3k)
First open the parenthesis
-18 -6k = 6 + 18k
collect like term
-18 -6 = 18k + 6k
-24= 24k
divide both-side of the equation by 24
-24/24 = 24k/24
-1 = k
k= -1
1.6m questions
2.0m answers