6v+21=-3(3-7v)

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Solution for 6v+21=-3(3-7v) equation:


Simplifying
6v + 21 = -3(3 + -7v)

Reorder the terms:
21 + 6v = -3(3 + -7v)
21 + 6v = (3 * -3 + -7v * -3)
21 + 6v = (-9 + 21v)

Solving
21 + 6v = -9 + 21v

Solving for variable 'v'.

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

Add '-21v' to each side of the equation.
21 + 6v + -21v = -9 + 21v + -21v

Combine like terms: 6v + -21v = -15v
21 + -15v = -9 + 21v + -21v

Combine like terms: 21v + -21v = 0
21 + -15v = -9 + 0
21 + -15v = -9

Add '-21' to each side of the equation.
21 + -21 + -15v = -9 + -21

Combine like terms: 21 + -21 = 0
0 + -15v = -9 + -21
-15v = -9 + -21

Combine like terms: -9 + -21 = -30
-15v = -30

Divide each side by '-15'.
v = 2

Simplifying
v = 2

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