3P-21=2P

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Solution for 3P-21=2P equation:


Simplifying
3P + -21 = 2P

Reorder the terms:
-21 + 3P = 2P

Solving
-21 + 3P = 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.
-21 + 3P + -2P = 2P + -2P

Combine like terms: 3P + -2P = 1P
-21 + 1P = 2P + -2P

Combine like terms: 2P + -2P = 0
-21 + 1P = 0

Add '21' to each side of the equation.
-21 + 21 + 1P = 0 + 21

Combine like terms: -21 + 21 = 0
0 + 1P = 0 + 21
1P = 0 + 21

Combine like terms: 0 + 21 = 21
1P = 21

Divide each side by '1'.
P = 21

Simplifying
P = 21

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