4(b+3)=b-9

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


Simplifying
4(b + 3) = b + -9

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

Reorder the terms:
12 + 4b = -9 + b

Solving
12 + 4b = -9 + b

Solving for variable 'b'.

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

Add '-1b' to each side of the equation.
12 + 4b + -1b = -9 + b + -1b

Combine like terms: 4b + -1b = 3b
12 + 3b = -9 + b + -1b

Combine like terms: b + -1b = 0
12 + 3b = -9 + 0
12 + 3b = -9

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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