-17-13=a

Solution for -17-13=a equation:

Simplifying
-17 + -13 = a

Combine like terms: -17 + -13 = -30
-30 = a

Solving
-30 = a

Solving for variable 'a'.

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

Add '-1a' to each side of the equation.
-30 + -1a = a + -1a

Combine like terms: a + -1a = 0
-30 + -1a = 0

Add '30' to each side of the equation.
-30 + 30 + -1a = 0 + 30

Combine like terms: -30 + 30 = 0
0 + -1a = 0 + 30
-1a = 0 + 30

Combine like terms: 0 + 30 = 30
-1a = 30

Divide each side by '-1'.
a = -30

Simplifying
a = -30