9-2a=y

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Solution for 9-2a=y equation: 


Simplifying
9 + -2a = y

Solving
9 + -2a = y

Solving for variable 'a'.

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

Add '-9' to each side of the equation.
9 + -9 + -2a = -9 + y

Combine like terms: 9 + -9 = 0
0 + -2a = -9 + y
-2a = -9 + y

Divide each side by '-2'.
a = 4.5 + -0.5y

Simplifying
a = 4.5 + -0.5y

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