x-y-3=a

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Solution for x-y-3=a equation: 


Simplifying
x + -1y + -3 = a

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

Solving
-3 + x + -1y = a

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 + -1y = 3 + a

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

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

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

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

Simplifying
x = 3 + a + y

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