40-A=28

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Solution for 40-A=28 equation: 


Simplifying
40 + -1A = 28

Solving
40 + -1A = 28

Solving for variable 'A'.

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

Add '-40' to each side of the equation.
40 + -40 + -1A = 28 + -40

Combine like terms: 40 + -40 = 0
0 + -1A = 28 + -40
-1A = 28 + -40

Combine like terms: 28 + -40 = -12
-1A = -12

Divide each side by '-1'.
A = 12

Simplifying
A = 12

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