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-28.8-a=20.2
We simplify the equation to the form, which is simple to understand
-28.8-a=20.2
We move all terms containing a to the left and all other terms to the right.
-1a=+20.2+28.8
We simplify left and right side of the equation.
-1a=+49
We divide both sides of the equation by -1 to get a.
a=-49
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