21=2(v-7)-7v

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Solution for 21=2(v-7)-7v equation:


Simplifying
21 = 2(v + -7) + -7v

Reorder the terms:
21 = 2(-7 + v) + -7v
21 = (-7 * 2 + v * 2) + -7v
21 = (-14 + 2v) + -7v

Combine like terms: 2v + -7v = -5v
21 = -14 + -5v

Solving
21 = -14 + -5v

Solving for variable 'v'.

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

Add '5v' to each side of the equation.
21 + 5v = -14 + -5v + 5v

Combine like terms: -5v + 5v = 0
21 + 5v = -14 + 0
21 + 5v = -14

Add '-21' to each side of the equation.
21 + -21 + 5v = -14 + -21

Combine like terms: 21 + -21 = 0
0 + 5v = -14 + -21
5v = -14 + -21

Combine like terms: -14 + -21 = -35
5v = -35

Divide each side by '5'.
v = -7

Simplifying
v = -7

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