13-b=4

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Solution for 13-b=4 equation: 


Simplifying
13 + -1b = 4

Solving
13 + -1b = 4

Solving for variable 'b'.

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

Add '-13' to each side of the equation.
13 + -13 + -1b = 4 + -13

Combine like terms: 13 + -13 = 0
0 + -1b = 4 + -13
-1b = 4 + -13

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

Divide each side by '-1'.
b = 9

Simplifying
b = 9

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