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Simplifying 7x + 3 + 7x + 2 + 7x = 399 Reorder the terms: 3 + 2 + 7x + 7x + 7x = 399 Combine like terms: 3 + 2 = 5 5 + 7x + 7x + 7x = 399 Combine like terms: 7x + 7x = 14x 5 + 14x + 7x = 399 Combine like terms: 14x + 7x = 21x 5 + 21x = 399 Solving 5 + 21x = 399 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5' to each side of the equation. 5 + -5 + 21x = 399 + -5 Combine like terms: 5 + -5 = 0 0 + 21x = 399 + -5 21x = 399 + -5 Combine like terms: 399 + -5 = 394 21x = 394 Divide each side by '21'. x = 18.76190476 Simplifying x = 18.76190476
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