Answer :
First we have to multiply 2 times 5k and -6 and simplify
-4k+2(5k-6)=-3k-39
-4k+10k-12=-3k-39
-4k+10k-12=-3k-39
6k-12=-3k-39 /+3k
9k-12=-39 /+12
9k=27 /:9
k=27:9
k=3 - its the answer
-4k+2(5k-6)=-3k-39
-4k+10k-12=-3k-39
-4k+10k-12=-3k-39
6k-12=-3k-39 /+3k
9k-12=-39 /+12
9k=27 /:9
k=27:9
k=3 - its the answer