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a+84=-4a-6
We simplify the equation to the form, which is simple to understand
a+84=-4a-6
We move all terms containing a to the left and all other terms to the right.
+1a+4a=-6-84
We simplify left and right side of the equation.
+5a=-90
We divide both sides of the equation by 5 to get a.
a=-18
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