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a=12-(1/2)(30)
We simplify the equation to the form, which is simple to understand
a=12-(1/2)*(30)
Reorder the terms in parentheses
multiplication of parentheses
a=12-(+15)
Remove unnecessary parentheses
a=12-15
We move all terms containing a to the left and all other terms to the right.
+1a=+12-15
We simplify left and right side of the equation.
+1a=-3
We divide both sides of the equation by 1 to get a.
a=-3
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