-3(b+7)=9

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Solution for -3(b+7)=9 equation: 


Simplifying
-3(b + 7) = 9

Reorder the terms:
-3(7 + b) = 9
(7 * -3 + b * -3) = 9
(-21 + -3b) = 9

Solving
-21 + -3b = 9

Solving for variable 'b'.

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

Add '21' to each side of the equation.
-21 + 21 + -3b = 9 + 21

Combine like terms: -21 + 21 = 0
0 + -3b = 9 + 21
-3b = 9 + 21

Combine like terms: 9 + 21 = 30
-3b = 30

Divide each side by '-3'.
b = -10

Simplifying
b = -10

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