21=-2b

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Solution for 21=-2b equation:


Simplifying
21 = -2b

Solving
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 + 2b = -2b + 2b

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

Add '-21' to each side of the equation.
21 + -21 + 2b = 0 + -21

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

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

Divide each side by '2'.
b = -10.5

Simplifying
b = -10.5

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