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Simplifying (3x + 7) + (x + 8) = 0 Reorder the terms: (7 + 3x) + (x + 8) = 0 Remove parenthesis around (7 + 3x) 7 + 3x + (x + 8) = 0 Reorder the terms: 7 + 3x + (8 + x) = 0 Remove parenthesis around (8 + x) 7 + 3x + 8 + x = 0 Reorder the terms: 7 + 8 + 3x + x = 0 Combine like terms: 7 + 8 = 15 15 + 3x + x = 0 Combine like terms: 3x + x = 4x 15 + 4x = 0 Solving 15 + 4x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-15' to each side of the equation. 15 + -15 + 4x = 0 + -15 Combine like terms: 15 + -15 = 0 0 + 4x = 0 + -15 4x = 0 + -15 Combine like terms: 0 + -15 = -15 4x = -15 Divide each side by '4'. x = -3.75 Simplifying x = -3.75
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