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Simplifying 7 + 2[-2x + 3] = 21 Reorder the terms: 7 + 2[3 + -2x] = 21 7 + [3 * 2 + -2x * 2] = 21 7 + [6 + -4x] = 21 Combine like terms: 7 + 6 = 13 13 + -4x = 21 Solving 13 + -4x = 21 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13' to each side of the equation. 13 + -13 + -4x = 21 + -13 Combine like terms: 13 + -13 = 0 0 + -4x = 21 + -13 -4x = 21 + -13 Combine like terms: 21 + -13 = 8 -4x = 8 Divide each side by '-4'. x = -2 Simplifying x = -2
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