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Simplifying 20 = -5[x + 7] Reorder the terms: 20 = -5[7 + x] 20 = [7 * -5 + x * -5] 20 = [-35 + -5x] Solving 20 = -35 + -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. 20 + 5x = -35 + -5x + 5x Combine like terms: -5x + 5x = 0 20 + 5x = -35 + 0 20 + 5x = -35 Add '-20' to each side of the equation. 20 + -20 + 5x = -35 + -20 Combine like terms: 20 + -20 = 0 0 + 5x = -35 + -20 5x = -35 + -20 Combine like terms: -35 + -20 = -55 5x = -55 Divide each side by '5'. x = -11 Simplifying x = -11
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