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a+4-6a-9=0
We simplify the equation to the form, which is simple to understand
a+4-6a-9=0
We move all terms containing a to the left and all other terms to the right.
+1a-6a=0-4+9
We simplify left and right side of the equation.
-5a=+5
We divide both sides of the equation by -5 to get a.
a=-1
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