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90+84a=a
We simplify the equation to the form, which is simple to understand
90+84a=a
We move all terms containing a to the left and all other terms to the right.
+84a-1a=-90
We simplify left and right side of the equation.
+83a=-90
We divide both sides of the equation by 83 to get a.
a=-1.0843373493976
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