-21=9-3p

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Solution for -21=9-3p equation:


Simplifying
-21 = 9 + -3p

Solving
-21 = 9 + -3p

Solving for variable 'p'.

Move all terms containing p to the left, all other terms to the right.

Add '3p' to each side of the equation.
-21 + 3p = 9 + -3p + 3p

Combine like terms: -3p + 3p = 0
-21 + 3p = 9 + 0
-21 + 3p = 9

Add '21' to each side of the equation.
-21 + 21 + 3p = 9 + 21

Combine like terms: -21 + 21 = 0
0 + 3p = 9 + 21
3p = 9 + 21

Combine like terms: 9 + 21 = 30
3p = 30

Divide each side by '3'.
p = 10

Simplifying
p = 10

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