(6+4+P)3=21

Solution for (6+4+P)3=21 equation:

Simplifying
(6 + 4 + P) * 3 = 21

Combine like terms: 6 + 4 = 10
(10 + P) * 3 = 21

Reorder the terms for easier multiplication:
3(10 + P) = 21
(10 * 3 + P * 3) = 21
(30 + 3P) = 21

Solving
30 + 3P = 21

Solving for variable 'P'.

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

Add '-30' to each side of the equation.
30 + -30 + 3P = 21 + -30

Combine like terms: 30 + -30 = 0
0 + 3P = 21 + -30
3P = 21 + -30

Combine like terms: 21 + -30 = -9
3P = -9

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

Simplifying
P = -3