X+7=-y

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Solution for X+7=-y equation: 


Simplifying
X + 7 = -1y

Reorder the terms:
7 + X = -1y

Solving
7 + X = -1y

Solving for variable 'X'.

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

Add '-7' to each side of the equation.
7 + -7 + X = -7 + -1y

Combine like terms: 7 + -7 = 0
0 + X = -7 + -1y
X = -7 + -1y

Simplifying
X = -7 + -1y

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