21-4V=7(-7V-3)+3V

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Solution for 21-4V=7(-7V-3)+3V equation: 


Simplifying
21 + -4V = 7(-7V + -3) + 3V

Reorder the terms:
21 + -4V = 7(-3 + -7V) + 3V
21 + -4V = (-3 * 7 + -7V * 7) + 3V
21 + -4V = (-21 + -49V) + 3V

Combine like terms: -49V + 3V = -46V
21 + -4V = -21 + -46V

Solving
21 + -4V = -21 + -46V

Solving for variable 'V'.

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

Add '46V' to each side of the equation.
21 + -4V + 46V = -21 + -46V + 46V

Combine like terms: -4V + 46V = 42V
21 + 42V = -21 + -46V + 46V

Combine like terms: -46V + 46V = 0
21 + 42V = -21 + 0
21 + 42V = -21

Add '-21' to each side of the equation.
21 + -21 + 42V = -21 + -21

Combine like terms: 21 + -21 = 0
0 + 42V = -21 + -21
42V = -21 + -21

Combine like terms: -21 + -21 = -42
42V = -42

Divide each side by '42'.
V = -1

Simplifying
V = -1

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