-p+3(p+3)=21

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Solution for -p+3(p+3)=21 equation: 


Simplifying
-1p + 3(p + 3) = 21

Reorder the terms:
-1p + 3(3 + p) = 21
-1p + (3 * 3 + p * 3) = 21
-1p + (9 + 3p) = 21

Reorder the terms:
9 + -1p + 3p = 21

Combine like terms: -1p + 3p = 2p
9 + 2p = 21

Solving
9 + 2p = 21

Solving for variable 'p'.

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

Add '-9' to each side of the equation.
9 + -9 + 2p = 21 + -9

Combine like terms: 9 + -9 = 0
0 + 2p = 21 + -9
2p = 21 + -9

Combine like terms: 21 + -9 = 12
2p = 12

Divide each side by '2'.
p = 6

Simplifying
p = 6

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