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-3-2a=27
We simplify the equation to the form, which is simple to understand
-3-2a=27
We move all terms containing a to the left and all other terms to the right.
-2a=+27+3
We simplify left and right side of the equation.
-2a=+30
We divide both sides of the equation by -2 to get a.
a=-15
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