3(x+1)+x=-9

Solution for 3(x+1)+x=-9 equation:

Simplifying
3(x + 1) + x = -9

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

Combine like terms: 3x + x = 4x
3 + 4x = -9

Solving
3 + 4x = -9

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + 4x = -9 + -3

Combine like terms: 3 + -3 = 0
0 + 4x = -9 + -3
4x = -9 + -3

Combine like terms: -9 + -3 = -12
4x = -12

Divide each side by '4'.
x = -3

Simplifying
x = -3