4(5-b)=21

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Solution for 4(5-b)=21 equation: 


Simplifying
4(5 + -1b) = 21
(5 * 4 + -1b * 4) = 21
(20 + -4b) = 21

Solving
20 + -4b = 21

Solving for variable 'b'.

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

Add '-20' to each side of the equation.
20 + -20 + -4b = 21 + -20

Combine like terms: 20 + -20 = 0
0 + -4b = 21 + -20
-4b = 21 + -20

Combine like terms: 21 + -20 = 1
-4b = 1

Divide each side by '-4'.
b = -0.25

Simplifying
b = -0.25

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