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a-42=98-9a
We simplify the equation to the form, which is simple to understand
a-42=98-9a
We move all terms containing a to the left and all other terms to the right.
+1a+9a=+98+42
We simplify left and right side of the equation.
+10a=+140
We divide both sides of the equation by 10 to get a.
a=14
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