a-2b=-9

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Solution for a-2b=-9 equation: 


Simplifying
a + -2b = -9

Solving
a + -2b = -9

Solving for variable 'a'.

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

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

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

Simplifying
a = -9 + 2b

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