20-p=11

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Solution for 20-p=11 equation: 


Simplifying
20 + -1p = 11

Solving
20 + -1p = 11

Solving for variable 'p'.

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

Add '-20' to each side of the equation.
20 + -20 + -1p = 11 + -20

Combine like terms: 20 + -20 = 0
0 + -1p = 11 + -20
-1p = 11 + -20

Combine like terms: 11 + -20 = -9
-1p = -9

Divide each side by '-1'.
p = 9

Simplifying
p = 9

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