21=4p-p

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Solution for 21=4p-p equation:


Simplifying
21 = 4p + -1p

Combine like terms: 4p + -1p = 3p
21 = 3p

Solving
21 = 3p

Solving for variable 'p'.

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

Add '-3p' to each side of the equation.
21 + -3p = 3p + -3p

Combine like terms: 3p + -3p = 0
21 + -3p = 0

Add '-21' to each side of the equation.
21 + -21 + -3p = 0 + -21

Combine like terms: 21 + -21 = 0
0 + -3p = 0 + -21
-3p = 0 + -21

Combine like terms: 0 + -21 = -21
-3p = -21

Divide each side by '-3'.
p = 7

Simplifying
p = 7

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