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Simplifying 3x + -9y + 7z = -21 Solving 3x + -9y + 7z = -21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9y' to each side of the equation. 3x + -9y + 9y + 7z = -21 + 9y Combine like terms: -9y + 9y = 0 3x + 0 + 7z = -21 + 9y 3x + 7z = -21 + 9y Add '-7z' to each side of the equation. 3x + 7z + -7z = -21 + 9y + -7z Combine like terms: 7z + -7z = 0 3x + 0 = -21 + 9y + -7z 3x = -21 + 9y + -7z Divide each side by '3'. x = -7 + 3y + -2.333333333z Simplifying x = -7 + 3y + -2.333333333z
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