4p-9=2p+21

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Solution for 4p-9=2p+21 equation:


Simplifying
4p + -9 = 2p + 21

Reorder the terms:
-9 + 4p = 2p + 21

Reorder the terms:
-9 + 4p = 21 + 2p

Solving
-9 + 4p = 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 + 4p + -2p = 21 + 2p + -2p

Combine like terms: 4p + -2p = 2p
-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 = 30
2p = 30

Divide each side by '2'.
p = 15

Simplifying
p = 15

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