Make all a and constant number in different side
10-7=16z-7z+2z
3=11z
z=3/11
9(2w−y)=21w−9y
First you multiply the numbers in the parenthesis by 9

subtract. 21w-18w=3w

add. -9y+9y=0

divide.

Final answer is 0.
Answer:
4
Step-by-step explanation:
9×3=27
2×7=14
1×4=4
nice logic
To solve this just put a 1 over the 15. So it would be 12/7 + 15/1 which is 16 5/7.