A-13=-4

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Solution for A-13=-4 equation: 


Simplifying
A + -13 = -4

Reorder the terms:
-13 + A = -4

Solving
-13 + A = -4

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 = -4 + 13

Combine like terms: -13 + 13 = 0
0 + A = -4 + 13
A = -4 + 13

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

Simplifying
A = 9

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