2b-3b+6=21

Solution for 2b-3b+6=21 equation:

Simplifying
2b + -3b + 6 = 21

Reorder the terms:
6 + 2b + -3b = 21

Combine like terms: 2b + -3b = -1b
6 + -1b = 21

Solving
6 + -1b = 21

Solving for variable 'b'.

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

Add '-6' to each side of the equation.
6 + -6 + -1b = 21 + -6

Combine like terms: 6 + -6 = 0
0 + -1b = 21 + -6
-1b = 21 + -6

Combine like terms: 21 + -6 = 15
-1b = 15

Divide each side by '-1'.
b = -15

Simplifying
b = -15