-3+12+(-13)=a

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Solution for -3+12+(-13)=a equation:


Simplifying
-3 + 12 + (-13) = a
-3 + 12 + -13 = a

Combine like terms: -3 + 12 = 9
9 + -13 = a

Combine like terms: 9 + -13 = -4
-4 = a

Solving
-4 = 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.
-4 + -1a = a + -1a

Combine like terms: a + -1a = 0
-4 + -1a = 0

Add '4' to each side of the equation.
-4 + 4 + -1a = 0 + 4

Combine like terms: -4 + 4 = 0
0 + -1a = 0 + 4
-1a = 0 + 4

Combine like terms: 0 + 4 = 4
-1a = 4

Divide each side by '-1'.
a = -4

Simplifying
a = -4

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