C. YFC hope this helps!!!
The distributive property: a(b + c) = ab + ac
12(6k + 3) + 4(7 - 5k) = 12(6k) + 12(3) + 4(7) + 4(-5k)
= 72k + 36 + 28 - 20k = 52k + 64
X = 1 & Y = -1 this is the way that we should find x
9x(6+x)
54x+9x
43x
So in the end the answer after doing the work it will be 43x
