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Simplifying (4x + 8) + (7x + 13) = 0 Reorder the terms: (8 + 4x) + (7x + 13) = 0 Remove parenthesis around (8 + 4x) 8 + 4x + (7x + 13) = 0 Reorder the terms: 8 + 4x + (13 + 7x) = 0 Remove parenthesis around (13 + 7x) 8 + 4x + 13 + 7x = 0 Reorder the terms: 8 + 13 + 4x + 7x = 0 Combine like terms: 8 + 13 = 21 21 + 4x + 7x = 0 Combine like terms: 4x + 7x = 11x 21 + 11x = 0 Solving 21 + 11x = 0 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 + 11x = 0 + -21 Combine like terms: 21 + -21 = 0 0 + 11x = 0 + -21 11x = 0 + -21 Combine like terms: 0 + -21 = -21 11x = -21 Divide each side by '11'. x = -1.909090909 Simplifying x = -1.909090909
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