a+13=-21

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Solution for a+13=-21 equation: 


Simplifying
a + 13 = -21

Reorder the terms:
13 + a = -21

Solving
13 + a = -21

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 = -21 + -13

Combine like terms: 13 + -13 = 0
0 + a = -21 + -13
a = -21 + -13

Combine like terms: -21 + -13 = -34
a = -34

Simplifying
a = -34

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