-21=4b

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Solution for -21=4b equation:


Simplifying
-21 = 4b

Solving
-21 = 4b

Solving for variable 'b'.

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

Add '-4b' to each side of the equation.
-21 + -4b = 4b + -4b

Combine like terms: 4b + -4b = 0
-21 + -4b = 0

Add '21' to each side of the equation.
-21 + 21 + -4b = 0 + 21

Combine like terms: -21 + 21 = 0
0 + -4b = 0 + 21
-4b = 0 + 21

Combine like terms: 0 + 21 = 21
-4b = 21

Divide each side by '-4'.
b = -5.25

Simplifying
b = -5.25

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