3.9=3b

Solution for 3.9=3b equation:

Simplifying
3.9 = 3b

Solving
3.9 = 3b

Solving for variable 'b'.

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

Add '-3b' to each side of the equation.
3.9 + -3b = 3b + -3b

Combine like terms: 3b + -3b = 0
3.9 + -3b = 0

Add '-3.9' to each side of the equation.
3.9 + -3.9 + -3b = 0 + -3.9

Combine like terms: 3.9 + -3.9 = 0.0
0.0 + -3b = 0 + -3.9
-3b = 0 + -3.9

Combine like terms: 0 + -3.9 = -3.9
-3b = -3.9

Divide each side by '-3'.
b = 1.3

Simplifying
b = 1.3