21=1-5p

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Solution for 21=1-5p equation:


Simplifying
21 = 1 + -5p

Solving
21 = 1 + -5p

Solving for variable 'p'.

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

Add '5p' to each side of the equation.
21 + 5p = 1 + -5p + 5p

Combine like terms: -5p + 5p = 0
21 + 5p = 1 + 0
21 + 5p = 1

Add '-21' to each side of the equation.
21 + -21 + 5p = 1 + -21

Combine like terms: 21 + -21 = 0
0 + 5p = 1 + -21
5p = 1 + -21

Combine like terms: 1 + -21 = -20
5p = -20

Divide each side by '5'.
p = -4

Simplifying
p = -4

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