3(b+4)=-9

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Solution for 3(b+4)=-9 equation: 


Simplifying
3(b + 4) = -9

Reorder the terms:
3(4 + b) = -9
(4 * 3 + b * 3) = -9
(12 + 3b) = -9

Solving
12 + 3b = -9

Solving for variable 'b'.

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

Add '-12' to each side of the equation.
12 + -12 + 3b = -9 + -12

Combine like terms: 12 + -12 = 0
0 + 3b = -9 + -12
3b = -9 + -12

Combine like terms: -9 + -12 = -21
3b = -21

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

Simplifying
b = -7

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