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-47a-28a=0
We simplify the equation to the form, which is simple to understand
-47a-28a=0
We move all terms containing a to the left and all other terms to the right.
-47a-28a=0
We simplify left and right side of the equation.
-75a=0
We divide both sides of the equation by -75 to get a.
a=-0
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