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12a-11=9a-1
We simplify the equation to the form, which is simple to understand
12a-11=9a-1
We move all terms containing a to the left and all other terms to the right.
+12a-9a=-1+11
We simplify left and right side of the equation.
+3a=+10
We divide both sides of the equation by 3 to get a.
a=3.33333333333
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