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Simplifying Xz + 7x + 3z + 21 = 0 Reorder the terms: 21 + 7x + 3z + zX = 0 Solving 21 + 7x + 3z + zX = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + 7x + 3z + -21 + zX = 0 + -21 Reorder the terms: 21 + -21 + 7x + 3z + zX = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 7x + 3z + zX = 0 + -21 7x + 3z + zX = 0 + -21 Combine like terms: 0 + -21 = -21 7x + 3z + zX = -21 Add '-3z' to each side of the equation. 7x + 3z + -3z + zX = -21 + -3z Combine like terms: 3z + -3z = 0 7x + 0 + zX = -21 + -3z 7x + zX = -21 + -3z Add '-1zX' to each side of the equation. 7x + zX + -1zX = -21 + -3z + -1zX Combine like terms: zX + -1zX = 0 7x + 0 = -21 + -3z + -1zX 7x = -21 + -3z + -1zX Divide each side by '7'. x = -3 + -0.4285714286z + -0.1428571429zX Simplifying x = -3 + -0.4285714286z + -0.1428571429zX
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