2p-21=42+9p

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Solution for 2p-21=42+9p equation:


Simplifying
2p + -21 = 42 + 9p

Reorder the terms:
-21 + 2p = 42 + 9p

Solving
-21 + 2p = 42 + 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 + 2p + -9p = 42 + 9p + -9p

Combine like terms: 2p + -9p = -7p
-21 + -7p = 42 + 9p + -9p

Combine like terms: 9p + -9p = 0
-21 + -7p = 42 + 0
-21 + -7p = 42

Add '21' to each side of the equation.
-21 + 21 + -7p = 42 + 21

Combine like terms: -21 + 21 = 0
0 + -7p = 42 + 21
-7p = 42 + 21

Combine like terms: 42 + 21 = 63
-7p = 63

Divide each side by '-7'.
p = -9

Simplifying
p = -9

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