-3(b+8)=-21

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Solution for -3(b+8)=-21 equation: 


Simplifying
-3(b + 8) = -21

Reorder the terms:
-3(8 + b) = -21
(8 * -3 + b * -3) = -21
(-24 + -3b) = -21

Solving
-24 + -3b = -21

Solving for variable 'b'.

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

Add '24' to each side of the equation.
-24 + 24 + -3b = -21 + 24

Combine like terms: -24 + 24 = 0
0 + -3b = -21 + 24
-3b = -21 + 24

Combine like terms: -21 + 24 = 3
-3b = 3

Divide each side by '-3'.
b = -1

Simplifying
b = -1

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