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-4a-8a=25.5
We simplify the equation to the form, which is simple to understand
-4a-8a=25.5
We move all terms containing a to the left and all other terms to the right.
-4a-8a=+25.5
We simplify left and right side of the equation.
-12a=+25.5
We divide both sides of the equation by -12 to get a.
a=-2.125
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