13=9+b

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Solution for 13=9+b equation:


Simplifying
13 = 9 + b

Solving
13 = 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.
13 + -1b = 9 + b + -1b

Combine like terms: b + -1b = 0
13 + -1b = 9 + 0
13 + -1b = 9

Add '-13' to each side of the equation.
13 + -13 + -1b = 9 + -13

Combine like terms: 13 + -13 = 0
0 + -1b = 9 + -13
-1b = 9 + -13

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

Divide each side by '-1'.
b = 4

Simplifying
b = 4

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