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Simplifying (7x + 6) + (4x + 7) = 90 Reorder the terms: (6 + 7x) + (4x + 7) = 90 Remove parenthesis around (6 + 7x) 6 + 7x + (4x + 7) = 90 Reorder the terms: 6 + 7x + (7 + 4x) = 90 Remove parenthesis around (7 + 4x) 6 + 7x + 7 + 4x = 90 Reorder the terms: 6 + 7 + 7x + 4x = 90 Combine like terms: 6 + 7 = 13 13 + 7x + 4x = 90 Combine like terms: 7x + 4x = 11x 13 + 11x = 90 Solving 13 + 11x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + 11x = 90 + -13 Combine like terms: 13 + -13 = 0 0 + 11x = 90 + -13 11x = 90 + -13 Combine like terms: 90 + -13 = 77 11x = 77 Divide each side by '11'. x = 7 Simplifying x = 7
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