3(x+6)+x=-18

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Solution for 3(x+6)+x=-18 equation:


Simplifying
3(x + 6) + x = -18

Reorder the terms:
3(6 + x) + x = -18
(6 * 3 + x * 3) + x = -18
(18 + 3x) + x = -18

Combine like terms: 3x + x = 4x
18 + 4x = -18

Solving
18 + 4x = -18

Solving for variable 'x'.

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

Add '-18' to each side of the equation.
18 + -18 + 4x = -18 + -18

Combine like terms: 18 + -18 = 0
0 + 4x = -18 + -18
4x = -18 + -18

Combine like terms: -18 + -18 = -36
4x = -36

Divide each side by '4'.
x = -9

Simplifying
x = -9

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