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a+a-=6930
We simplify the equation to the form, which is simple to understand
a+a-=6930
We move all terms containing a to the left and all other terms to the right.
+1a+1a=-6930
We simplify left and right side of the equation.
+2a=-6930
We divide both sides of the equation by 2 to get a.
a=-3465
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