21=3p+12

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Solution for 21=3p+12 equation:


Simplifying
21 = 3p + 12

Reorder the terms:
21 = 12 + 3p

Solving
21 = 12 + 3p

Solving for variable 'p'.

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

Add '-3p' to each side of the equation.
21 + -3p = 12 + 3p + -3p

Combine like terms: 3p + -3p = 0
21 + -3p = 12 + 0
21 + -3p = 12

Add '-21' to each side of the equation.
21 + -21 + -3p = 12 + -21

Combine like terms: 21 + -21 = 0
0 + -3p = 12 + -21
-3p = 12 + -21

Combine like terms: 12 + -21 = -9
-3p = -9

Divide each side by '-3'.
p = 3

Simplifying
p = 3

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