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Simplifying 21 + -1[2x + -4] = 13 Reorder the terms: 21 + -1[-4 + 2x] = 13 21 + [-4 * -1 + 2x * -1] = 13 21 + [4 + -2x] = 13 Combine like terms: 21 + 4 = 25 25 + -2x = 13 Solving 25 + -2x = 13 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-25' to each side of the equation. 25 + -25 + -2x = 13 + -25 Combine like terms: 25 + -25 = 0 0 + -2x = 13 + -25 -2x = 13 + -25 Combine like terms: 13 + -25 = -12 -2x = -12 Divide each side by '-2'. x = 6 Simplifying x = 6
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