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Simplifying 3x + y + 7z = 21 Solving 3x + y + 7z = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1y' to each side of the equation. 3x + y + -1y + 7z = 21 + -1y Combine like terms: y + -1y = 0 3x + 0 + 7z = 21 + -1y 3x + 7z = 21 + -1y Add '-7z' to each side of the equation. 3x + 7z + -7z = 21 + -1y + -7z Combine like terms: 7z + -7z = 0 3x + 0 = 21 + -1y + -7z 3x = 21 + -1y + -7z Divide each side by '3'. x = 7 + -0.3333333333y + -2.333333333z Simplifying x = 7 + -0.3333333333y + -2.333333333z
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