9=b-4

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Solution for 9=b-4 equation:


Simplifying
9 = b + -4

Reorder the terms:
9 = -4 + b

Solving
9 = -4 + 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 = -4 + b + -1b

Combine like terms: b + -1b = 0
9 + -1b = -4 + 0
9 + -1b = -4

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

Combine like terms: 9 + -9 = 0
0 + -1b = -4 + -9
-1b = -4 + -9

Combine like terms: -4 + -9 = -13
-1b = -13

Divide each side by '-1'.
b = 13

Simplifying
b = 13

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