(x+9)+(3x+12)=

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Solution for (x+9)+(3x+12)= equation:


Simplifying
(x + 9) + (3x + 12) = 0

Reorder the terms:
(9 + x) + (3x + 12) = 0

Remove parenthesis around (9 + x)
9 + x + (3x + 12) = 0

Reorder the terms:
9 + x + (12 + 3x) = 0

Remove parenthesis around (12 + 3x)
9 + x + 12 + 3x = 0

Reorder the terms:
9 + 12 + x + 3x = 0

Combine like terms: 9 + 12 = 21
21 + x + 3x = 0

Combine like terms: x + 3x = 4x
21 + 4x = 0

Solving
21 + 4x = 0

Solving for variable 'x'.

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

Add '-21' to each side of the equation.
21 + -21 + 4x = 0 + -21

Combine like terms: 21 + -21 = 0
0 + 4x = 0 + -21
4x = 0 + -21

Combine like terms: 0 + -21 = -21
4x = -21

Divide each side by '4'.
x = -5.25

Simplifying
x = -5.25

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