a=x+y-9

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Solution for a=x+y-9 equation: 


Simplifying
a = x + y + -9

Reorder the terms:
a = -9 + x + y

Solving
a = -9 + x + y

Solving for variable 'a'.

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

Simplifying
a = -9 + x + y

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