21=p+13

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Solution for 21=p+13 equation:


Simplifying
21 = p + 13

Reorder the terms:
21 = 13 + p

Solving
21 = 13 + 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 = 13 + p + -1p

Combine like terms: p + -1p = 0
21 + -1p = 13 + 0
21 + -1p = 13

Add '-21' to each side of the equation.
21 + -21 + -1p = 13 + -21

Combine like terms: 21 + -21 = 0
0 + -1p = 13 + -21
-1p = 13 + -21

Combine like terms: 13 + -21 = -8
-1p = -8

Divide each side by '-1'.
p = 8

Simplifying
p = 8

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