X+Y-1=3

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Solution for X+Y-1=3 equation:


Simplifying
X + Y + -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

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