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Simplifying -90 = 2[-10 + -5x] -90 = [-10 * 2 + -5x * 2] -90 = [-20 + -10x] Solving -90 = -20 + -10x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '10x' to each side of the equation. -90 + 10x = -20 + -10x + 10x Combine like terms: -10x + 10x = 0 -90 + 10x = -20 + 0 -90 + 10x = -20 Add '90' to each side of the equation. -90 + 90 + 10x = -20 + 90 Combine like terms: -90 + 90 = 0 0 + 10x = -20 + 90 10x = -20 + 90 Combine like terms: -20 + 90 = 70 10x = 70 Divide each side by '10'. x = 7 Simplifying x = 7
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