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8-11=a-9
We simplify the equation to the form, which is simple to understand
8-11=a-9
We move all terms containing a to the left and all other terms to the right.
-1a=-9-8+11
We simplify left and right side of the equation.
-1a=-6
We divide both sides of the equation by -01 to get a.
a=6
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