A-1=18

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Solution for A-1=18 equation: 


Simplifying
A + -1 = 18

Reorder the terms:
-1 + A = 18

Solving
-1 + A = 18

Solving for variable 'A'.

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

Add '1' to each side of the equation.
-1 + 1 + A = 18 + 1

Combine like terms: -1 + 1 = 0
0 + A = 18 + 1
A = 18 + 1

Combine like terms: 18 + 1 = 19
A = 19

Simplifying
A = 19

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