12b+21=-2b-21

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Solution for 12b+21=-2b-21 equation:


Simplifying
12b + 21 = -2b + -21

Reorder the terms:
21 + 12b = -2b + -21

Reorder the terms:
21 + 12b = -21 + -2b

Solving
21 + 12b = -21 + -2b

Solving for variable 'b'.

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

Add '2b' to each side of the equation.
21 + 12b + 2b = -21 + -2b + 2b

Combine like terms: 12b + 2b = 14b
21 + 14b = -21 + -2b + 2b

Combine like terms: -2b + 2b = 0
21 + 14b = -21 + 0
21 + 14b = -21

Add '-21' to each side of the equation.
21 + -21 + 14b = -21 + -21

Combine like terms: 21 + -21 = 0
0 + 14b = -21 + -21
14b = -21 + -21

Combine like terms: -21 + -21 = -42
14b = -42

Divide each side by '14'.
b = -3

Simplifying
b = -3

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