3=-b+2b

Solution for 3=-b+2b equation:

Simplifying
3 = -1b + 2b

Combine like terms: -1b + 2b = 1b
3 = 1b

Solving
3 = 1b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
3 + -1b = 1b + -1b

Combine like terms: 1b + -1b = 0
3 + -1b = 0

Add '-3' to each side of the equation.
3 + -3 + -1b = 0 + -3

Combine like terms: 3 + -3 = 0
0 + -1b = 0 + -3
-1b = 0 + -3

Combine like terms: 0 + -3 = -3
-1b = -3

Divide each side by '-1'.
b = 3

Simplifying
b = 3