y+x-3=0

Solution for y+x-3=0 equation:

Simplifying
y + x + -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