-21=7v+7(v+3)

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


Simplifying
-21 = 7v + 7(v + 3)

Reorder the terms:
-21 = 7v + 7(3 + v)
-21 = 7v + (3 * 7 + v * 7)
-21 = 7v + (21 + 7v)

Reorder the terms:
-21 = 21 + 7v + 7v

Combine like terms: 7v + 7v = 14v
-21 = 21 + 14v

Solving
-21 = 21 + 14v

Solving for variable 'v'.

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

Add '-14v' to each side of the equation.
-21 + -14v = 21 + 14v + -14v

Combine like terms: 14v + -14v = 0
-21 + -14v = 21 + 0
-21 + -14v = 21

Add '21' to each side of the equation.
-21 + 21 + -14v = 21 + 21

Combine like terms: -21 + 21 = 0
0 + -14v = 21 + 21
-14v = 21 + 21

Combine like terms: 21 + 21 = 42
-14v = 42

Divide each side by '-14'.
v = -3

Simplifying
v = -3

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