y+x-1=3

Solution for y+x-1=3 equation:

Simplifying
y + x + -1 = 3

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

Solving
-1 + x + y = 3

Solving for variable 'x'.

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

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

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

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

Combine like terms: 3 + 1 = 4
x + y = 4

Add '-1y' to each side of the equation.
x + y + -1y = 4 + -1y

Combine like terms: y + -1y = 0
x + 0 = 4 + -1y
x = 4 + -1y

Simplifying
x = 4 + -1y