21=-3(12+V)

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Solution for 21=-3(12+V) equation:


Simplifying
21 = -3(12 + V)
21 = (12 * -3 + V * -3)
21 = (-36 + -3V)

Solving
21 = -36 + -3V

Solving for variable 'V'.

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

Add '3V' to each side of the equation.
21 + 3V = -36 + -3V + 3V

Combine like terms: -3V + 3V = 0
21 + 3V = -36 + 0
21 + 3V = -36

Add '-21' to each side of the equation.
21 + -21 + 3V = -36 + -21

Combine like terms: 21 + -21 = 0
0 + 3V = -36 + -21
3V = -36 + -21

Combine like terms: -36 + -21 = -57
3V = -57

Divide each side by '3'.
V = -19

Simplifying
V = -19

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