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

Combine like terms: 4p + 2p = 6p
-9 + 6p = 21

Solving
-9 + 6p = 21

Solving for variable 'p'.

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

Add '9' to each side of the equation.
-9 + 9 + 6p = 21 + 9

Combine like terms: -9 + 9 = 0
0 + 6p = 21 + 9
6p = 21 + 9

Combine like terms: 21 + 9 = 30
6p = 30

Divide each side by '6'.
p = 5

Simplifying
p = 5

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