p--9=12

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Solution for p--9=12 equation:


p--9=12

We simplify the equation to the form, which is simple to understand 
p+9=12

We move all terms containing p to the left and all other terms to the right. 
+1p=+12-9

We simplify left and right side of the equation. 
+1p=+3

We divide both sides of the equation by 1 to get p. 
p=3

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