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Simplifying 15x + 21 = 5x + 311 Reorder the terms: 21 + 15x = 5x + 311 Reorder the terms: 21 + 15x = 311 + 5x Solving 21 + 15x = 311 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + 15x + -5x = 311 + 5x + -5x Combine like terms: 15x + -5x = 10x 21 + 10x = 311 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + 10x = 311 + 0 21 + 10x = 311 Add '-21' to each side of the equation. 21 + -21 + 10x = 311 + -21 Combine like terms: 21 + -21 = 0 0 + 10x = 311 + -21 10x = 311 + -21 Combine like terms: 311 + -21 = 290 10x = 290 Divide each side by '10'. x = 29 Simplifying x = 29
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