a-b=-1

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Solution for a-b=-1 equation: 


Simplifying
a + -1b = -1

Solving
a + -1b = -1

Solving for variable 'a'.

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

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

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

Simplifying
a = -1 + b

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