6X+3(X+2)=-21

Solution for 6X+3(X+2)=-21 equation:

Simplifying
6X + 3(X + 2) = -21

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

Reorder the terms:
6 + 6X + 3X = -21

Combine like terms: 6X + 3X = 9X
6 + 9X = -21

Solving
6 + 9X = -21

Solving for variable 'X'.

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

Add '-6' to each side of the equation.
6 + -6 + 9X = -21 + -6

Combine like terms: 6 + -6 = 0
0 + 9X = -21 + -6
9X = -21 + -6

Combine like terms: -21 + -6 = -27
9X = -27

Divide each side by '9'.
X = -3

Simplifying
X = -3