21=v-(9)

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Solution for 21=v-(9) equation:


Simplifying
21 = v + -1(9)

Multiply -1 * 9
21 = v + -9

Reorder the terms:
21 = -9 + v

Solving
21 = -9 + v

Solving for variable 'v'.

Move all terms containing v to the left, all other terms to the right.

Add '-1v' to each side of the equation.
21 + -1v = -9 + v + -1v

Combine like terms: v + -1v = 0
21 + -1v = -9 + 0
21 + -1v = -9

Add '-21' to each side of the equation.
21 + -21 + -1v = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -1v = -9 + -21
-1v = -9 + -21

Combine like terms: -9 + -21 = -30
-1v = -30

Divide each side by '-1'.
v = 30

Simplifying
v = 30

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