x+2y-z=-7

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


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

Solving
x + 2y + -1z = -7

Solving for variable 'x'.

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

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

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

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

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

Simplifying
x = -7 + -2y + z

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