(b-9)-(b+3)=8b

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Solution for (b-9)-(b+3)=8b equation:


Simplifying
(b + -9) + -1(b + 3) = 8b

Reorder the terms:
(-9 + b) + -1(b + 3) = 8b

Remove parenthesis around (-9 + b)
-9 + b + -1(b + 3) = 8b

Reorder the terms:
-9 + b + -1(3 + b) = 8b
-9 + b + (3 * -1 + b * -1) = 8b
-9 + b + (-3 + -1b) = 8b

Reorder the terms:
-9 + -3 + b + -1b = 8b

Combine like terms: -9 + -3 = -12
-12 + b + -1b = 8b

Combine like terms: b + -1b = 0
-12 + 0 = 8b
-12 = 8b

Solving
-12 = 8b

Solving for variable 'b'.

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

Add '-8b' to each side of the equation.
-12 + -8b = 8b + -8b

Combine like terms: 8b + -8b = 0
-12 + -8b = 0

Add '12' to each side of the equation.
-12 + 12 + -8b = 0 + 12

Combine like terms: -12 + 12 = 0
0 + -8b = 0 + 12
-8b = 0 + 12

Combine like terms: 0 + 12 = 12
-8b = 12

Divide each side by '-8'.
b = -1.5

Simplifying
b = -1.5

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