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2a-9=4a-11
We simplify the equation to the form, which is simple to understand
2a-9=4a-11
We move all terms containing a to the left and all other terms to the right.
+2a-4a=-11+9
We simplify left and right side of the equation.
-2a=-2
We divide both sides of the equation by -2 to get a.
a=1
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