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Simplifying 4x + 4(x + 7) = 128 Reorder the terms: 4x + 4(7 + x) = 128 4x + (7 * 4 + x * 4) = 128 4x + (28 + 4x) = 128 Reorder the terms: 28 + 4x + 4x = 128 Combine like terms: 4x + 4x = 8x 28 + 8x = 128 Solving 28 + 8x = 128 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-28' to each side of the equation. 28 + -28 + 8x = 128 + -28 Combine like terms: 28 + -28 = 0 0 + 8x = 128 + -28 8x = 128 + -28 Combine like terms: 128 + -28 = 100 8x = 100 Divide each side by '8'. x = 12.5 Simplifying x = 12.5
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