A-45=-78

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Solution for A-45=-78 equation: 


Simplifying
A + -45 = -78

Reorder the terms:
-45 + A = -78

Solving
-45 + A = -78

Solving for variable 'A'.

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

Add '45' to each side of the equation.
-45 + 45 + A = -78 + 45

Combine like terms: -45 + 45 = 0
0 + A = -78 + 45
A = -78 + 45

Combine like terms: -78 + 45 = -33
A = -33

Simplifying
A = -33

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