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Simplifying 3x + 21y + 7x = 0 Reorder the terms: 3x + 7x + 21y = 0 Combine like terms: 3x + 7x = 10x 10x + 21y = 0 Solving 10x + 21y = 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. 10x + 21y + -21y = 0 + -21y Combine like terms: 21y + -21y = 0 10x + 0 = 0 + -21y 10x = 0 + -21y Remove the zero: 10x = -21y Divide each side by '10'. x = -2.1y Simplifying x = -2.1y
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