Solve

v/9 - v/ 21 +1/9
Answer is 0
Is this right

You mean "v" is an unknown? You cant solve an unknown without an equation.

To solve the expression v/9 - v/21 + 1/9, you can follow these steps:

Step 1: Find the common denominator for the fractions. In this case, the common denominator is 63 because it is a multiple of both 9 and 21.

Step 2: Rewrite each fraction with the common denominator:

v/9 becomes (7v)/63 (multiply the numerator and denominator by 7 to get 63 in the denominator)
v/21 becomes (3v)/63 (multiply the numerator and denominator by 3 to get 63 in the denominator)
1/9 remains the same, as its denominator is already 9.

Step 3: Combine the fractions:

(7v)/63 - (3v)/63 + 1/9

Now that the denominators are the same, we can combine the numerators:

((7v) - (3v) + 1) / 63

Simplifying further:

(4v + 1) / 63

Now, to check if the answer is 0, set the numerator equal to 0 and solve for v:

4v + 1 = 0
4v = -1
v = -1/4

Since v = -1/4, the answer to the expression is not 0. So, it seems there might be a mistake or misunderstanding in the solution provided.