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Simplifying -13 + [x + 4(x + 1)] = 0 Reorder the terms: -13 + [x + 4(1 + x)] = 0 -13 + [x + (1 * 4 + x * 4)] = 0 -13 + [x + (4 + 4x)] = 0 Reorder the terms: -13 + [4 + x + 4x] = 0 Combine like terms: x + 4x = 5x -13 + [4 + 5x] = 0 Remove brackets around [4 + 5x] -13 + 4 + 5x = 0 Combine like terms: -13 + 4 = -9 -9 + 5x = 0 Solving -9 + 5x = 0 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + 5x = 0 + 9 Combine like terms: -9 + 9 = 0 0 + 5x = 0 + 9 5x = 0 + 9 Combine like terms: 0 + 9 = 9 5x = 9 Divide each side by '5'. x = 1.8 Simplifying x = 1.8
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