21=1+9p+2

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Solution for 21=1+9p+2 equation:


Simplifying
21 = 1 + 9p + 2

Reorder the terms:
21 = 1 + 2 + 9p

Combine like terms: 1 + 2 = 3
21 = 3 + 9p

Solving
21 = 3 + 9p

Solving for variable 'p'.

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

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

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

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

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

Combine like terms: 3 + -21 = -18
-9p = -18

Divide each side by '-9'.
p = 2

Simplifying
p = 2

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