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Simplifying 7x + 21y + 78 = 0 Reorder the terms: 78 + 7x + 21y = 0 Solving 78 + 7x + 21y = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-78' to each side of the equation. 78 + 7x + -78 + 21y = 0 + -78 Reorder the terms: 78 + -78 + 7x + 21y = 0 + -78 Combine like terms: 78 + -78 = 0 0 + 7x + 21y = 0 + -78 7x + 21y = 0 + -78 Combine like terms: 0 + -78 = -78 7x + 21y = -78 Add '-21y' to each side of the equation. 7x + 21y + -21y = -78 + -21y Combine like terms: 21y + -21y = 0 7x + 0 = -78 + -21y 7x = -78 + -21y Divide each side by '7'. x = -11.14285714 + -3y Simplifying x = -11.14285714 + -3y
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