X+y+3=0

Solution for X+y+3=0 equation:

Simplifying
X + y + 3 = 0

Reorder the terms:
3 + X + y = 0

Solving
3 + X + y = 0

Solving for variable 'X'.

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

Add '-3' to each side of the equation.
3 + X + -3 + y = 0 + -3

Reorder the terms:
3 + -3 + X + y = 0 + -3

Combine like terms: 3 + -3 = 0
0 + X + y = 0 + -3
X + y = 0 + -3

Combine like terms: 0 + -3 = -3
X + y = -3

Add '-1y' to each side of the equation.
X + y + -1y = -3 + -1y

Combine like terms: y + -1y = 0
X + 0 = -3 + -1y
X = -3 + -1y

Simplifying
X = -3 + -1y