a-b=9

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Solution for a-b=9 equation: 


Simplifying
a + -1b = 9

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

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

Simplifying
a = 9 + b

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