(X+9)-(x+3)=0

Solution for (X+9)-(x+3)=0 equation:

Simplifying
(X + 9) + -1(x + 3) = 0

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

Remove parenthesis around (9 + X)
9 + X + -1(x + 3) = 0

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

Reorder the terms:
9 + -3 + X + -1x = 0

Combine like terms: 9 + -3 = 6
6 + X + -1x = 0

Solving
6 + X + -1x = 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 + X + -6 + -1x = 0 + -6

Reorder the terms:
6 + -6 + X + -1x = 0 + -6

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

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

Add 'x' to each side of the equation.
X + -1x + x = -6 + x

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

Simplifying
X = -6 + x