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Simplifying 21x + 3 = 17x + 15 Reorder the terms: 3 + 21x = 17x + 15 Reorder the terms: 3 + 21x = 15 + 17x Solving 3 + 21x = 15 + 17x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-17x' to each side of the equation. 3 + 21x + -17x = 15 + 17x + -17x Combine like terms: 21x + -17x = 4x 3 + 4x = 15 + 17x + -17x Combine like terms: 17x + -17x = 0 3 + 4x = 15 + 0 3 + 4x = 15 Add '-3' to each side of the equation. 3 + -3 + 4x = 15 + -3 Combine like terms: 3 + -3 = 0 0 + 4x = 15 + -3 4x = 15 + -3 Combine like terms: 15 + -3 = 12 4x = 12 Divide each side by '4'. x = 3 Simplifying x = 3
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