A+3=21-2a

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Solution for A+3=21-2a equation: 


Simplifying
A + 3 = 21 + -2a

Reorder the terms:
3 + A = 21 + -2a

Solving
3 + A = 21 + -2a

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 + -2a

Combine like terms: 3 + -3 = 0
0 + A = 21 + -3 + -2a
A = 21 + -3 + -2a

Combine like terms: 21 + -3 = 18
A = 18 + -2a

Simplifying
A = 18 + -2a

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