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Simplifying 9x + -3y + 4z = 21 Solving 9x + -3y + 4z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '3y' to each side of the equation. 9x + -3y + 3y + 4z = 21 + 3y Combine like terms: -3y + 3y = 0 9x + 0 + 4z = 21 + 3y 9x + 4z = 21 + 3y Add '-4z' to each side of the equation. 9x + 4z + -4z = 21 + 3y + -4z Combine like terms: 4z + -4z = 0 9x + 0 = 21 + 3y + -4z 9x = 21 + 3y + -4z Divide each side by '9'. x = 2.333333333 + 0.3333333333y + -0.4444444444z Simplifying x = 2.333333333 + 0.3333333333y + -0.4444444444z
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