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-9=1+4a+6a
We simplify the equation to the form, which is simple to understand
-9=1+4a+6a
We move all terms containing a to the left and all other terms to the right.
-4a-6a=+1+9
We simplify left and right side of the equation.
-10a=+10
We divide both sides of the equation by -10 to get a.
a=-1
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