-3v-21=7-(7v+8)

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Solution for -3v-21=7-(7v+8) equation:


Simplifying
-3v + -21 = 7 + -1(7v + 8)

Reorder the terms:
-21 + -3v = 7 + -1(7v + 8)

Reorder the terms:
-21 + -3v = 7 + -1(8 + 7v)
-21 + -3v = 7 + (8 * -1 + 7v * -1)
-21 + -3v = 7 + (-8 + -7v)

Combine like terms: 7 + -8 = -1
-21 + -3v = -1 + -7v

Solving
-21 + -3v = -1 + -7v

Solving for variable 'v'.

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

Add '7v' to each side of the equation.
-21 + -3v + 7v = -1 + -7v + 7v

Combine like terms: -3v + 7v = 4v
-21 + 4v = -1 + -7v + 7v

Combine like terms: -7v + 7v = 0
-21 + 4v = -1 + 0
-21 + 4v = -1

Add '21' to each side of the equation.
-21 + 21 + 4v = -1 + 21

Combine like terms: -21 + 21 = 0
0 + 4v = -1 + 21
4v = -1 + 21

Combine like terms: -1 + 21 = 20
4v = 20

Divide each side by '4'.
v = 5

Simplifying
v = 5

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