x+3y=n-1

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Solution for x+3y=n-1 equation: 


Simplifying
x + 3y = n + -1

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

Solving
x + 3y = -1 + n

Solving for variable 'x'.

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

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

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

Simplifying
x = -1 + n + -3y

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