21=3-3p

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Solution for 21=3-3p equation:


21=3-3p

We simplify the equation to the form, which is simple to understand 
21=3-3p

We move all terms containing p to the left and all other terms to the right. 
+3p=+3-21

We simplify left and right side of the equation. 
+3p=-18

We divide both sides of the equation by 03 to get p. 
p=-6

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