X+Y+X-Y=90

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Solution for X+Y+X-Y=90 equation: 


Simplifying
X + Y + X + -1Y = 90

Reorder the terms:
X + X + Y + -1Y = 90

Combine like terms: X + X = 2X
2X + Y + -1Y = 90

Combine like terms: Y + -1Y = 0
2X + 0 = 90
2X = 90

Solving
2X = 90

Solving for variable 'X'.

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

Divide each side by '2'.
X = 45

Simplifying
X = 45

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