(6x+15)+(3x+21)=

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Solution for (6x+15)+(3x+21)= equation:


Simplifying
(6x + 15) + (3x + 21) = 0

Reorder the terms:
(15 + 6x) + (3x + 21) = 0

Remove parenthesis around (15 + 6x)
15 + 6x + (3x + 21) = 0

Reorder the terms:
15 + 6x + (21 + 3x) = 0

Remove parenthesis around (21 + 3x)
15 + 6x + 21 + 3x = 0

Reorder the terms:
15 + 21 + 6x + 3x = 0

Combine like terms: 15 + 21 = 36
36 + 6x + 3x = 0

Combine like terms: 6x + 3x = 9x
36 + 9x = 0

Solving
36 + 9x = 0

Solving for variable 'x'.

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

Add '-36' to each side of the equation.
36 + -36 + 9x = 0 + -36

Combine like terms: 36 + -36 = 0
0 + 9x = 0 + -36
9x = 0 + -36

Combine like terms: 0 + -36 = -36
9x = -36

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

Simplifying
x = -4

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