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28=9a-15-39
We simplify the equation to the form, which is simple to understand
28=9a-15-39
We move all terms containing a to the left and all other terms to the right.
-9a=-15-39-28
We simplify left and right side of the equation.
-9a=-82
We divide both sides of the equation by -09 to get a.
a=9.11111111111
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