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Simplifying 7x + 7(x + 1) + 7(x + 2) = 57 Reorder the terms: 7x + 7(1 + x) + 7(x + 2) = 57 7x + (1 * 7 + x * 7) + 7(x + 2) = 57 7x + (7 + 7x) + 7(x + 2) = 57 Reorder the terms: 7x + 7 + 7x + 7(2 + x) = 57 7x + 7 + 7x + (2 * 7 + x * 7) = 57 7x + 7 + 7x + (14 + 7x) = 57 Reorder the terms: 7 + 14 + 7x + 7x + 7x = 57 Combine like terms: 7 + 14 = 21 21 + 7x + 7x + 7x = 57 Combine like terms: 7x + 7x = 14x 21 + 14x + 7x = 57 Combine like terms: 14x + 7x = 21x 21 + 21x = 57 Solving 21 + 21x = 57 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-21' to each side of the equation. 21 + -21 + 21x = 57 + -21 Combine like terms: 21 + -21 = 0 0 + 21x = 57 + -21 21x = 57 + -21 Combine like terms: 57 + -21 = 36 21x = 36 Divide each side by '21'. x = 1.714285714 Simplifying x = 1.714285714
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