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Simplifying x + 6x = 21 + 13 + 3x Combine like terms: x + 6x = 7x 7x = 21 + 13 + 3x Combine like terms: 21 + 13 = 34 7x = 34 + 3x Solving 7x = 34 + 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. 7x + -3x = 34 + 3x + -3x Combine like terms: 7x + -3x = 4x 4x = 34 + 3x + -3x Combine like terms: 3x + -3x = 0 4x = 34 + 0 4x = 34 Divide each side by '4'. x = 8.5 Simplifying x = 8.5
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