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Simplifying 3x * 7 = (x + 13) * 8 Reorder the terms for easier multiplication: 3 * 7x = (x + 13) * 8 Multiply 3 * 7 21x = (x + 13) * 8 Reorder the terms: 21x = (13 + x) * 8 Reorder the terms for easier multiplication: 21x = 8(13 + x) 21x = (13 * 8 + x * 8) 21x = (104 + 8x) Solving 21x = 104 + 8x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8x' to each side of the equation. 21x + -8x = 104 + 8x + -8x Combine like terms: 21x + -8x = 13x 13x = 104 + 8x + -8x Combine like terms: 8x + -8x = 0 13x = 104 + 0 13x = 104 Divide each side by '13'. x = 8 Simplifying x = 8
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