-21=3b

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Solution for -21=3b equation:


Simplifying
-21 = 3b

Solving
-21 = 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.
-21 + -3b = 3b + -3b

Combine like terms: 3b + -3b = 0
-21 + -3b = 0

Add '21' to each side of the equation.
-21 + 21 + -3b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -3b = 0 + 21
-3b = 0 + 21

Combine like terms: 0 + 21 = 21
-3b = 21

Divide each side by '-3'.
b = -7

Simplifying
b = -7

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