A-21=100

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Solution for A-21=100 equation: 


Simplifying
A + -21 = 100

Reorder the terms:
-21 + A = 100

Solving
-21 + A = 100

Solving for variable 'A'.

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

Add '21' to each side of the equation.
-21 + 21 + A = 100 + 21

Combine like terms: -21 + 21 = 0
0 + A = 100 + 21
A = 100 + 21

Combine like terms: 100 + 21 = 121
A = 121

Simplifying
A = 121

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