(3x+6)+(x+9)=

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Solution for (3x+6)+(x+9)= equation:


Simplifying
(3x + 6) + (x + 9) = 0

Reorder the terms:
(6 + 3x) + (x + 9) = 0

Remove parenthesis around (6 + 3x)
6 + 3x + (x + 9) = 0

Reorder the terms:
6 + 3x + (9 + x) = 0

Remove parenthesis around (9 + x)
6 + 3x + 9 + x = 0

Reorder the terms:
6 + 9 + 3x + x = 0

Combine like terms: 6 + 9 = 15
15 + 3x + x = 0

Combine like terms: 3x + x = 4x
15 + 4x = 0

Solving
15 + 4x = 0

Solving for variable 'x'.

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

Add '-15' to each side of the equation.
15 + -15 + 4x = 0 + -15

Combine like terms: 15 + -15 = 0
0 + 4x = 0 + -15
4x = 0 + -15

Combine like terms: 0 + -15 = -15
4x = -15

Divide each side by '4'.
x = -3.75

Simplifying
x = -3.75

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