13+(b-9)=15

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Solution for 13+(b-9)=15 equation:


Simplifying
13 + (b + -9) = 15

Reorder the terms:
13 + (-9 + b) = 15

Remove parenthesis around (-9 + b)
13 + -9 + b = 15

Combine like terms: 13 + -9 = 4
4 + b = 15

Solving
4 + b = 15

Solving for variable 'b'.

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

Add '-4' to each side of the equation.
4 + -4 + b = 15 + -4

Combine like terms: 4 + -4 = 0
0 + b = 15 + -4
b = 15 + -4

Combine like terms: 15 + -4 = 11
b = 11

Simplifying
b = 11

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