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Simplifying 2x + 5y + -7z = -9 Solving 2x + 5y + -7z = -9 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5y' to each side of the equation. 2x + 5y + -5y + -7z = -9 + -5y Combine like terms: 5y + -5y = 0 2x + 0 + -7z = -9 + -5y 2x + -7z = -9 + -5y Add '7z' to each side of the equation. 2x + -7z + 7z = -9 + -5y + 7z Combine like terms: -7z + 7z = 0 2x + 0 = -9 + -5y + 7z 2x = -9 + -5y + 7z Divide each side by '2'. x = -4.5 + -2.5y + 3.5z Simplifying x = -4.5 + -2.5y + 3.5z
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