-9=15+b-3

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Solution for -9=15+b-3 equation:


Simplifying
-9 = 15 + b + -3

Reorder the terms:
-9 = 15 + -3 + b

Combine like terms: 15 + -3 = 12
-9 = 12 + b

Solving
-9 = 12 + 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.
-9 + -1b = 12 + b + -1b

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

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

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

Combine like terms: 12 + 9 = 21
-1b = 21

Divide each side by '-1'.
b = -21

Simplifying
b = -21

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