-300+x-100+y-400=0

Solution for -300+x-100+y-400=0 equation:

Simplifying
-300 + x + -100 + y + -400 = 0

Reorder the terms:
-300 + -100 + -400 + x + y = 0

Combine like terms: -300 + -100 = -400
-400 + -400 + x + y = 0

Combine like terms: -400 + -400 = -800
-800 + x + y = 0

Solving
-800 + x + y = 0

Solving for variable 'x'.

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

Add '800' to each side of the equation.
-800 + x + 800 + y = 0 + 800

Reorder the terms:
-800 + 800 + x + y = 0 + 800

Combine like terms: -800 + 800 = 0
0 + x + y = 0 + 800
x + y = 0 + 800

Combine like terms: 0 + 800 = 800
x + y = 800

Add '-1y' to each side of the equation.
x + y + -1y = 800 + -1y

Combine like terms: y + -1y = 0
x + 0 = 800 + -1y
x = 800 + -1y

Simplifying
x = 800 + -1y