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Simplifying 12x + 6y + -12z = 21 Solving 12x + 6y + -12z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6y' to each side of the equation. 12x + 6y + -6y + -12z = 21 + -6y Combine like terms: 6y + -6y = 0 12x + 0 + -12z = 21 + -6y 12x + -12z = 21 + -6y Add '12z' to each side of the equation. 12x + -12z + 12z = 21 + -6y + 12z Combine like terms: -12z + 12z = 0 12x + 0 = 21 + -6y + 12z 12x = 21 + -6y + 12z Divide each side by '12'. x = 1.75 + -0.5y + z Simplifying x = 1.75 + -0.5y + z
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