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Simplifying 20 + -1[8x + -1] = 4 Reorder the terms: 20 + -1[-1 + 8x] = 4 20 + [-1 * -1 + 8x * -1] = 4 20 + [1 + -8x] = 4 Combine like terms: 20 + 1 = 21 21 + -8x = 4 Solving 21 + -8x = 4 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 + -8x = 4 + -21 Combine like terms: 21 + -21 = 0 0 + -8x = 4 + -21 -8x = 4 + -21 Combine like terms: 4 + -21 = -17 -8x = -17 Divide each side by '-8'. x = 2.125 Simplifying x = 2.125
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