A-15=-21

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Solution for A-15=-21 equation: 


Simplifying
A + -15 = -21

Reorder the terms:
-15 + A = -21

Solving
-15 + A = -21

Solving for variable 'A'.

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

Add '15' to each side of the equation.
-15 + 15 + A = -21 + 15

Combine like terms: -15 + 15 = 0
0 + A = -21 + 15
A = -21 + 15

Combine like terms: -21 + 15 = -6
A = -6

Simplifying
A = -6

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