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Simplifying 7x + 8y + 9z = -149 Solving 7x + 8y + 9z = -149 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. 7x + 8y + -8y + 9z = -149 + -8y Combine like terms: 8y + -8y = 0 7x + 0 + 9z = -149 + -8y 7x + 9z = -149 + -8y Add '-9z' to each side of the equation. 7x + 9z + -9z = -149 + -8y + -9z Combine like terms: 9z + -9z = 0 7x + 0 = -149 + -8y + -9z 7x = -149 + -8y + -9z Divide each side by '7'. x = -21.28571429 + -1.142857143y + -1.285714286z Simplifying x = -21.28571429 + -1.142857143y + -1.285714286z
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