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Simplifying X + 2y + 4z = -7 Solving X + 2y + 4z = -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 + 4z = -7 + -2y Combine like terms: 2y + -2y = 0 X + 0 + 4z = -7 + -2y X + 4z = -7 + -2y Add '-4z' to each side of the equation. X + 4z + -4z = -7 + -2y + -4z Combine like terms: 4z + -4z = 0 X + 0 = -7 + -2y + -4z X = -7 + -2y + -4z Simplifying X = -7 + -2y + -4z
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