13+a-4=-3

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Solution for 13+a-4=-3 equation: 


Simplifying
13 + a + -4 = -3

Reorder the terms:
13 + -4 + a = -3

Combine like terms: 13 + -4 = 9
9 + a = -3

Solving
9 + a = -3

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + a = -3 + -9

Combine like terms: 9 + -9 = 0
0 + a = -3 + -9
a = -3 + -9

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

Simplifying
a = -12

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