9=21-2p

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Solution for 9=21-2p equation:


Simplifying
9 = 21 + -2p

Solving
9 = 21 + -2p

Solving for variable 'p'.

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

Add '2p' to each side of the equation.
9 + 2p = 21 + -2p + 2p

Combine like terms: -2p + 2p = 0
9 + 2p = 21 + 0
9 + 2p = 21

Add '-9' to each side of the equation.
9 + -9 + 2p = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2p = 21 + -9
2p = 21 + -9

Combine like terms: 21 + -9 = 12
2p = 12

Divide each side by '2'.
p = 6

Simplifying
p = 6

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