42=3.5v

Solution for 42=3.5v equation:

Simplifying
42 = 3.5v

Solving
42 = 3.5v

Solving for variable 'v'.

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

Add '-3.5v' to each side of the equation.
42 + -3.5v = 3.5v + -3.5v

Combine like terms: 3.5v + -3.5v = 0.0
42 + -3.5v = 0.0

Add '-42' to each side of the equation.
42 + -42 + -3.5v = 0.0 + -42

Combine like terms: 42 + -42 = 0
0 + -3.5v = 0.0 + -42
-3.5v = 0.0 + -42

Combine like terms: 0.0 + -42 = -42
-3.5v = -42

Divide each side by '-3.5'.
v = 12

Simplifying
v = 12