1-a=-1

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Solution for 1-a=-1 equation: 


Simplifying
1 + -1a = -1

Solving
1 + -1a = -1

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 + -1a = -1 + -1

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

Combine like terms: -1 + -1 = -2
-1a = -2

Divide each side by '-1'.
a = 2

Simplifying
a = 2

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