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Simplifying 21y + 7x + -49z = 0 Reorder the terms: 7x + 21y + -49z = 0 Solving 7x + 21y + -49z = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21y' to each side of the equation. 7x + 21y + -21y + -49z = 0 + -21y Combine like terms: 21y + -21y = 0 7x + 0 + -49z = 0 + -21y 7x + -49z = 0 + -21y Remove the zero: 7x + -49z = -21y Add '49z' to each side of the equation. 7x + -49z + 49z = -21y + 49z Combine like terms: -49z + 49z = 0 7x + 0 = -21y + 49z 7x = -21y + 49z Divide each side by '7'. x = -3y + 7z Simplifying x = -3y + 7z
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