21=4+p

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Solution for 21=4+p equation:


Simplifying
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 = -17
-1p = -17

Divide each side by '-1'.
p = 17

Simplifying
p = 17

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