40=20-2v

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Solution for 40=20-2v equation:


Simplifying
40 = 20 + -2v

Solving
40 = 20 + -2v

Solving for variable 'v'.

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

Add '2v' to each side of the equation.
40 + 2v = 20 + -2v + 2v

Combine like terms: -2v + 2v = 0
40 + 2v = 20 + 0
40 + 2v = 20

Add '-40' to each side of the equation.
40 + -40 + 2v = 20 + -40

Combine like terms: 40 + -40 = 0
0 + 2v = 20 + -40
2v = 20 + -40

Combine like terms: 20 + -40 = -20
2v = -20

Divide each side by '2'.
v = -10

Simplifying
v = -10

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