Answer:
-26 +4k
Explanation:
-3(2+4k)+7(2k-1)−3(2+4k)+7(2k−1)
Notice that we have 2k-1 as a factor 2 times and 2+4k as a factor 2 times
-3(2+4k)−3(2+4k)+7(2k−1)+7(2k-1)
Think of the factor as a variable 2k-1 = M and 2+4k = P
-3(P)−3(P)+7(M)+7(M)
Combine like terms
-6P + 14M
Now substitute back M =2k-1 and P = 2+4k
-6(2+4k) +14 (2k-1)
Distribute
-12 -24k + 28k -14
Combine like terms
-26 +4k