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5a+13=4a-7
We simplify the equation to the form, which is simple to understand
5a+13=4a-7
We move all terms containing a to the left and all other terms to the right.
+5a-4a=-7-13
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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