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-9+p/2=-12
We simplify the equation to the form, which is simple to understand
-9+p/2=-12
We move all terms containing p to the left and all other terms to the right.
+ 0.5p=-12+9
We simplify left and right side of the equation.
+ 0.5p=-3
We divide both sides of the equation by 0.5 to get p.
p=-6
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