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p+13.5=-6.9
We simplify the equation to the form, which is simple to understand
p+13.5=-6.9
We move all terms containing p to the left and all other terms to the right.
+1p=-6.9-13.5
We simplify left and right side of the equation.
+1p=-20.4
We divide both sides of the equation by 1 to get p.
p=-20.4
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