a-13=-20

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Solution for a-13=-20 equation: 


Simplifying
a + -13 = -20

Reorder the terms:
-13 + a = -20

Solving
-13 + a = -20

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 = -20 + 13

Combine like terms: -13 + 13 = 0
0 + a = -20 + 13
a = -20 + 13

Combine like terms: -20 + 13 = -7
a = -7

Simplifying
a = -7

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