21=-3p-6

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Solution for 21=-3p-6 equation:


Simplifying
21 = -3p + -6

Reorder the terms:
21 = -6 + -3p

Solving
21 = -6 + -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 = -6 + -3p + 3p

Combine like terms: -3p + 3p = 0
21 + 3p = -6 + 0
21 + 3p = -6

Add '-21' to each side of the equation.
21 + -21 + 3p = -6 + -21

Combine like terms: 21 + -21 = 0
0 + 3p = -6 + -21
3p = -6 + -21

Combine like terms: -6 + -21 = -27
3p = -27

Divide each side by '3'.
p = -9

Simplifying
p = -9

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