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Simplifying (7x + 13) + (4x + 15) = 90 Reorder the terms: (13 + 7x) + (4x + 15) = 90 Remove parenthesis around (13 + 7x) 13 + 7x + (4x + 15) = 90 Reorder the terms: 13 + 7x + (15 + 4x) = 90 Remove parenthesis around (15 + 4x) 13 + 7x + 15 + 4x = 90 Reorder the terms: 13 + 15 + 7x + 4x = 90 Combine like terms: 13 + 15 = 28 28 + 7x + 4x = 90 Combine like terms: 7x + 4x = 11x 28 + 11x = 90 Solving 28 + 11x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 11x = 90 + -28 Combine like terms: 28 + -28 = 0 0 + 11x = 90 + -28 11x = 90 + -28 Combine like terms: 90 + -28 = 62 11x = 62 Divide each side by '11'. x = 5.636363636 Simplifying x = 5.636363636
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