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Simplifying 9x + 3y + -5z = 21 Solving 9x + 3y + -5z = 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 + -5z = 21 + -3y Combine like terms: 3y + -3y = 0 9x + 0 + -5z = 21 + -3y 9x + -5z = 21 + -3y Add '5z' to each side of the equation. 9x + -5z + 5z = 21 + -3y + 5z Combine like terms: -5z + 5z = 0 9x + 0 = 21 + -3y + 5z 9x = 21 + -3y + 5z Divide each side by '9'. x = 2.333333333 + -0.3333333333y + 0.5555555556z Simplifying x = 2.333333333 + -0.3333333333y + 0.5555555556z
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