A+(-3)=-21

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Solution for A+(-3)=-21 equation: 


Simplifying
A + (-3) = -21
A + -3 = -21

Reorder the terms:
-3 + A = -21

Solving
-3 + A = -21

Solving for variable 'A'.

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

Add '3' to each side of the equation.
-3 + 3 + A = -21 + 3

Combine like terms: -3 + 3 = 0
0 + A = -21 + 3
A = -21 + 3

Combine like terms: -21 + 3 = -18
A = -18

Simplifying
A = -18

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