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-2a-9=0
We simplify the equation to the form, which is simple to understand
-2a-9=0
We move all terms containing a to the left and all other terms to the right.
-2a=0+9
We simplify left and right side of the equation.
-2a=+9
We divide both sides of the equation by -2 to get a.
a=-4.5
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