5(7x-4)=-3 (-9+12)+8 nilai k -7

5(7x-4) = -3 (-9+12) + 8
35x = -3 (3) + 8 + 20
35x = -9 + 28
35x = 19
x = 19/35

nilai k-7

5(7(k-7) - 4) = -3 (-9+12) + 8
5(7k - 49 - 4) = -3 (3) + 8
5(7k - 53) = -9 + 8
35k - 265 = -1
35k = -1 + 265
35k = 264
k = 264/35

kalok menurut saya..soalnya ada variabel yg kurang