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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 = 2 2 + 7x + 4x = 90 Combine like terms: 7x + 4x = 11x 2 + 11x = 90 Solving 2 + 11x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-2' to each side of the equation. 2 + -2 + 11x = 90 + -2 Combine like terms: 2 + -2 = 0 0 + 11x = 90 + -2 11x = 90 + -2 Combine like terms: 90 + -2 = 88 11x = 88 Divide each side by '11'. x = 8 Simplifying x = 8
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