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Simplifying 7X + 21 = 3X + 5 Reorder the terms: 21 + 7X = 3X + 5 Reorder the terms: 21 + 7X = 5 + 3X Solving 21 + 7X = 5 + 3X Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '-3X' to each side of the equation. 21 + 7X + -3X = 5 + 3X + -3X Combine like terms: 7X + -3X = 4X 21 + 4X = 5 + 3X + -3X Combine like terms: 3X + -3X = 0 21 + 4X = 5 + 0 21 + 4X = 5 Add '-21' to each side of the equation. 21 + -21 + 4X = 5 + -21 Combine like terms: 21 + -21 = 0 0 + 4X = 5 + -21 4X = 5 + -21 Combine like terms: 5 + -21 = -16 4X = -16 Divide each side by '4'. X = -4 Simplifying X = -4
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