15=p+21

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Solution for 15=p+21 equation:


Simplifying
15 = p + 21

Reorder the terms:
15 = 21 + p

Solving
15 = 21 + 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.
15 + -1p = 21 + p + -1p

Combine like terms: p + -1p = 0
15 + -1p = 21 + 0
15 + -1p = 21

Add '-15' to each side of the equation.
15 + -15 + -1p = 21 + -15

Combine like terms: 15 + -15 = 0
0 + -1p = 21 + -15
-1p = 21 + -15

Combine like terms: 21 + -15 = 6
-1p = 6

Divide each side by '-1'.
p = -6

Simplifying
p = -6

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