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Simplifying 5x + 4(4x + -4) = 131 Reorder the terms: 5x + 4(-4 + 4x) = 131 5x + (-4 * 4 + 4x * 4) = 131 5x + (-16 + 16x) = 131 Reorder the terms: -16 + 5x + 16x = 131 Combine like terms: 5x + 16x = 21x -16 + 21x = 131 Solving -16 + 21x = 131 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '16' to each side of the equation. -16 + 16 + 21x = 131 + 16 Combine like terms: -16 + 16 = 0 0 + 21x = 131 + 16 21x = 131 + 16 Combine like terms: 131 + 16 = 147 21x = 147 Divide each side by '21'. x = 7 Simplifying x = 7
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