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Simplifying 21 = -4 + [5x + 5] Reorder the terms: 21 = -4 + [5 + 5x] Remove brackets around [5 + 5x] 21 = -4 + 5 + 5x Combine like terms: -4 + 5 = 1 21 = 1 + 5x Solving 21 = 1 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 21 + -5x = 1 + 5x + -5x Combine like terms: 5x + -5x = 0 21 + -5x = 1 + 0 21 + -5x = 1 Add '-21' to each side of the equation. 21 + -21 + -5x = 1 + -21 Combine like terms: 21 + -21 = 0 0 + -5x = 1 + -21 -5x = 1 + -21 Combine like terms: 1 + -21 = -20 -5x = -20 Divide each side by '-5'. x = 4 Simplifying x = 4
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