-(x+3)-(x+3)=0

Solution for -(x+3)-(x+3)=0 equation:

Simplifying
-1(x + 3) + -1(x + 3) = 0

Reorder the terms:
-1(3 + x) + -1(x + 3) = 0
(3 * -1 + x * -1) + -1(x + 3) = 0
(-3 + -1x) + -1(x + 3) = 0

Reorder the terms:
-3 + -1x + -1(3 + x) = 0
-3 + -1x + (3 * -1 + x * -1) = 0
-3 + -1x + (-3 + -1x) = 0

Reorder the terms:
-3 + -3 + -1x + -1x = 0

Combine like terms: -3 + -3 = -6
-6 + -1x + -1x = 0

Combine like terms: -1x + -1x = -2x
-6 + -2x = 0

Solving
-6 + -2x = 0

Solving for variable 'x'.

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

Add '6' to each side of the equation.
-6 + 6 + -2x = 0 + 6

Combine like terms: -6 + 6 = 0
0 + -2x = 0 + 6
-2x = 0 + 6

Combine like terms: 0 + 6 = 6
-2x = 6

Divide each side by '-2'.
x = -3

Simplifying
x = -3