21=p-4

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Solution for 21=p-4 equation:


Simplifying
21 = p + -4

Reorder the terms:
21 = -4 + p

Solving
21 = -4 + p

Solving for variable 'p'.

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

Add '-1p' to each side of the equation.
21 + -1p = -4 + p + -1p

Combine like terms: p + -1p = 0
21 + -1p = -4 + 0
21 + -1p = -4

Add '-21' to each side of the equation.
21 + -21 + -1p = -4 + -21

Combine like terms: 21 + -21 = 0
0 + -1p = -4 + -21
-1p = -4 + -21

Combine like terms: -4 + -21 = -25
-1p = -25

Divide each side by '-1'.
p = 25

Simplifying
p = 25

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