2p+2(p+3)=21

Solution for 2p+2(p+3)=21 equation:

Simplifying
2p + 2(p + 3) = 21

Reorder the terms:
2p + 2(3 + p) = 21
2p + (3 * 2 + p * 2) = 21
2p + (6 + 2p) = 21

Reorder the terms:
6 + 2p + 2p = 21

Combine like terms: 2p + 2p = 4p
6 + 4p = 21

Solving
6 + 4p = 21

Solving for variable 'p'.

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

Add '-6' to each side of the equation.
6 + -6 + 4p = 21 + -6

Combine like terms: 6 + -6 = 0
0 + 4p = 21 + -6
4p = 21 + -6

Combine like terms: 21 + -6 = 15
4p = 15

Divide each side by '4'.
p = 3.75

Simplifying
p = 3.75