25-a=40

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Solution for 25-a=40 equation: 


Simplifying
25 + -1a = 40

Solving
25 + -1a = 40

Solving for variable 'a'.

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

Add '-25' to each side of the equation.
25 + -25 + -1a = 40 + -25

Combine like terms: 25 + -25 = 0
0 + -1a = 40 + -25
-1a = 40 + -25

Combine like terms: 40 + -25 = 15
-1a = 15

Divide each side by '-1'.
a = -15

Simplifying
a = -15

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