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Simplifying 3x + 2y + -7z = 21 Solving 3x + 2y + -7z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2y' to each side of the equation. 3x + 2y + -2y + -7z = 21 + -2y Combine like terms: 2y + -2y = 0 3x + 0 + -7z = 21 + -2y 3x + -7z = 21 + -2y Add '7z' to each side of the equation. 3x + -7z + 7z = 21 + -2y + 7z Combine like terms: -7z + 7z = 0 3x + 0 = 21 + -2y + 7z 3x = 21 + -2y + 7z Divide each side by '3'. x = 7 + -0.6666666667y + 2.333333333z Simplifying x = 7 + -0.6666666667y + 2.333333333z
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