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2a-a-1=19
We simplify the equation to the form, which is simple to understand
2a-a-1=19
We move all terms containing a to the left and all other terms to the right.
+2a-1a=+19+1
We simplify left and right side of the equation.
+1a=+20
We divide both sides of the equation by 1 to get a.
a=20
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