-a-b=-9

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Solution for -a-b=-9 equation: 


Simplifying
-1a + -1b = -9

Solving
-1a + -1b = -9

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.
-1a + -1b + b = -9 + b

Combine like terms: -1b + b = 0
-1a + 0 = -9 + b
-1a = -9 + b

Divide each side by '-1'.
a = 9 + -1b

Simplifying
a = 9 + -1b

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