(12+a)+13=

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Solution for (12+a)+13= equation:


Simplifying
(12 + a) + 13 = 0

Remove parenthesis around (12 + a)
12 + a + 13 = 0

Reorder the terms:
12 + 13 + a = 0

Combine like terms: 12 + 13 = 25
25 + a = 0

Solving
25 + a = 0

Solving for variable 'a'.

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

Add '-25' to each side of the equation.
25 + -25 + a = 0 + -25

Combine like terms: 25 + -25 = 0
0 + a = 0 + -25
a = 0 + -25

Combine like terms: 0 + -25 = -25
a = -25

Simplifying
a = -25

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