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Simplifying 2x + 5y + 21 = 0 Reorder the terms: 21 + 2x + 5y = 0 Solving 21 + 2x + 5y = 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 + 2x + -21 + 5y = 0 + -21 Reorder the terms: 21 + -21 + 2x + 5y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 2x + 5y = 0 + -21 2x + 5y = 0 + -21 Combine like terms: 0 + -21 = -21 2x + 5y = -21 Add '-5y' to each side of the equation. 2x + 5y + -5y = -21 + -5y Combine like terms: 5y + -5y = 0 2x + 0 = -21 + -5y 2x = -21 + -5y Divide each side by '2'. x = -10.5 + -2.5y Simplifying x = -10.5 + -2.5y
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