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20a-19a=12-23
We simplify the equation to the form, which is simple to understand
20a-19a=12-23
We move all terms containing a to the left and all other terms to the right.
+20a-19a=+12-23
We simplify left and right side of the equation.
+1a=-11
We divide both sides of the equation by 1 to get a.
a=-11
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