13=21-v

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Solution for 13=21-v equation:


Simplifying
13 = 21 + -1v

Solving
13 = 21 + -1v

Solving for variable 'v'.

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

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

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

Add '-13' to each side of the equation.
13 + -13 + v = 21 + -13

Combine like terms: 13 + -13 = 0
0 + v = 21 + -13
v = 21 + -13

Combine like terms: 21 + -13 = 8
v = 8

Simplifying
v = 8

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