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Simplifying x + -3y + 21 = 0 Reorder the terms: 21 + x + -3y = 0 Solving 21 + x + -3y = 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 + x + -21 + -3y = 0 + -21 Reorder the terms: 21 + -21 + x + -3y = 0 + -21 Combine like terms: 21 + -21 = 0 0 + x + -3y = 0 + -21 x + -3y = 0 + -21 Combine like terms: 0 + -21 = -21 x + -3y = -21 Add '3y' to each side of the equation. x + -3y + 3y = -21 + 3y Combine like terms: -3y + 3y = 0 x + 0 = -21 + 3y x = -21 + 3y Simplifying x = -21 + 3y
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