X+y+2z=-7

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Solution for X+y+2z=-7 equation: 


Simplifying
X + y + 2z = -7

Solving
X + y + 2z = -7

Solving for variable 'X'.

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

Add '-1y' to each side of the equation.
X + y + -1y + 2z = -7 + -1y

Combine like terms: y + -1y = 0
X + 0 + 2z = -7 + -1y
X + 2z = -7 + -1y

Add '-2z' to each side of the equation.
X + 2z + -2z = -7 + -1y + -2z

Combine like terms: 2z + -2z = 0
X + 0 = -7 + -1y + -2z
X = -7 + -1y + -2z

Simplifying
X = -7 + -1y + -2z

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