40=10-v+9

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Solution for 40=10-v+9 equation:


Simplifying
40 = 10 + -1v + 9

Reorder the terms:
40 = 10 + 9 + -1v

Combine like terms: 10 + 9 = 19
40 = 19 + -1v

Solving
40 = 19 + -1v

Solving for variable 'v'.

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

Add 'v' to each side of the equation.
40 + v = 19 + -1v + v

Combine like terms: -1v + v = 0
40 + v = 19 + 0
40 + v = 19

Add '-40' to each side of the equation.
40 + -40 + v = 19 + -40

Combine like terms: 40 + -40 = 0
0 + v = 19 + -40
v = 19 + -40

Combine like terms: 19 + -40 = -21
v = -21

Simplifying
v = -21

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