105=109-v

Solution for 105=109-v equation:

Simplifying
105 = 109 + -1v

Solving
105 = 109 + -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.
105 + v = 109 + -1v + v

Combine like terms: -1v + v = 0
105 + v = 109 + 0
105 + v = 109

Add '-105' to each side of the equation.
105 + -105 + v = 109 + -105

Combine like terms: 105 + -105 = 0
0 + v = 109 + -105
v = 109 + -105

Combine like terms: 109 + -105 = 4
v = 4

Simplifying
v = 4