13+a=25-b

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Solution for 13+a=25-b equation: 


Simplifying
13 + a = 25 + -1b

Solving
13 + a = 25 + -1b

Solving for variable 'a'.

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

Add '-13' to each side of the equation.
13 + -13 + a = 25 + -13 + -1b

Combine like terms: 13 + -13 = 0
0 + a = 25 + -13 + -1b
a = 25 + -13 + -1b

Combine like terms: 25 + -13 = 12
a = 12 + -1b

Simplifying
a = 12 + -1b

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