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Simplifying 15x + 8y + 21z = 231 Solving 15x + 8y + 21z = 231 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8y' to each side of the equation. 15x + 8y + -8y + 21z = 231 + -8y Combine like terms: 8y + -8y = 0 15x + 0 + 21z = 231 + -8y 15x + 21z = 231 + -8y Add '-21z' to each side of the equation. 15x + 21z + -21z = 231 + -8y + -21z Combine like terms: 21z + -21z = 0 15x + 0 = 231 + -8y + -21z 15x = 231 + -8y + -21z Divide each side by '15'. x = 15.4 + -0.5333333333y + -1.4z Simplifying x = 15.4 + -0.5333333333y + -1.4z
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