21=-p+8

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Solution for 21=-p+8 equation: 


Simplifying
21 = -1p + 8

Reorder the terms:
21 = 8 + -1p

Solving
21 = 8 + -1p

Solving for variable 'p'.

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

Add 'p' to each side of the equation.
21 + p = 8 + -1p + p

Combine like terms: -1p + p = 0
21 + p = 8 + 0
21 + p = 8

Add '-21' to each side of the equation.
21 + -21 + p = 8 + -21

Combine like terms: 21 + -21 = 0
0 + p = 8 + -21
p = 8 + -21

Combine like terms: 8 + -21 = -13
p = -13

Simplifying
p = -13

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