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Simplifying 2x + 3y + -7z = 21 Solving 2x + 3y + -7z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-3y' to each side of the equation. 2x + 3y + -3y + -7z = 21 + -3y Combine like terms: 3y + -3y = 0 2x + 0 + -7z = 21 + -3y 2x + -7z = 21 + -3y Add '7z' to each side of the equation. 2x + -7z + 7z = 21 + -3y + 7z Combine like terms: -7z + 7z = 0 2x + 0 = 21 + -3y + 7z 2x = 21 + -3y + 7z Divide each side by '2'. x = 10.5 + -1.5y + 3.5z Simplifying x = 10.5 + -1.5y + 3.5z
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