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Simplifying 7x + 3y + z = 200 Solving 7x + 3y + z = 200 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. 7x + 3y + -3y + z = 200 + -3y Combine like terms: 3y + -3y = 0 7x + 0 + z = 200 + -3y 7x + z = 200 + -3y Add '-1z' to each side of the equation. 7x + z + -1z = 200 + -3y + -1z Combine like terms: z + -1z = 0 7x + 0 = 200 + -3y + -1z 7x = 200 + -3y + -1z Divide each side by '7'. x = 28.57142857 + -0.4285714286y + -0.1428571429z Simplifying x = 28.57142857 + -0.4285714286y + -0.1428571429z
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