9=7p-13p-21

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Solution for 9=7p-13p-21 equation: 


Simplifying
9 = 7p + -13p + -21

Reorder the terms:
9 = -21 + 7p + -13p

Combine like terms: 7p + -13p = -6p
9 = -21 + -6p

Solving
9 = -21 + -6p

Solving for variable 'p'.

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

Add '6p' to each side of the equation.
9 + 6p = -21 + -6p + 6p

Combine like terms: -6p + 6p = 0
9 + 6p = -21 + 0
9 + 6p = -21

Add '-9' to each side of the equation.
9 + -9 + 6p = -21 + -9

Combine like terms: 9 + -9 = 0
0 + 6p = -21 + -9
6p = -21 + -9

Combine like terms: -21 + -9 = -30
6p = -30

Divide each side by '6'.
p = -5

Simplifying
p = -5

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