4k+mn=n-3
3(4k+mn)= 12k+mn
So, 12k+mn=n
731.04!! You multiply all together!! Mark me brainliest ?
Answer:
15 x 1 + 5 x 3 = 30
Step-by-step explanation:
If you turn the x into a one then it multiplies 15 by one and then it remains at 15, then you multiply 5 and 3 so that's 15 and then 15 + 15 is 30.