Answer:
X=10
Step-by-step explanation:
Answer:
If the world is unfair to everybody isn't it still fair.
Step-by-step explanation:
ok ummm....
Why is Donald Trump president.
Why am I on brainly instead of doing my school work.
And, why are my socks not matching.
Answer:
The number is 2
Step-by-step explanation:
Twice a number (z) = 2*z = 2z
Twice a number (z) added to 21 = 2z + 21
9 times the number added to 7 = 9z + 7
9z + 7 = 2z + 21
Subtract 2z form both sides
9z - 2z + 7 = 21
7z + 7 = 21
Subtract 7 from both sides
7z = 21 - 7
7z = 14
Divide both sides by 7
z = 14/7
z = 2