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