30-v=10

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Solution for 30-v=10 equation: 


Simplifying
30 + -1v = 10

Solving
30 + -1v = 10

Solving for variable 'v'.

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

Add '-30' to each side of the equation.
30 + -30 + -1v = 10 + -30

Combine like terms: 30 + -30 = 0
0 + -1v = 10 + -30
-1v = 10 + -30

Combine like terms: 10 + -30 = -20
-1v = -20

Divide each side by '-1'.
v = 20

Simplifying
v = 20

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