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Simplifying -20 = -2(x + -9) Reorder the terms: -20 = -2(-9 + x) -20 = (-9 * -2 + x * -2) -20 = (18 + -2x) Solving -20 = 18 + -2x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '2x' to each side of the equation. -20 + 2x = 18 + -2x + 2x Combine like terms: -2x + 2x = 0 -20 + 2x = 18 + 0 -20 + 2x = 18 Add '20' to each side of the equation. -20 + 20 + 2x = 18 + 20 Combine like terms: -20 + 20 = 0 0 + 2x = 18 + 20 2x = 18 + 20 Combine like terms: 18 + 20 = 38 2x = 38 Divide each side by '2'. x = 19 Simplifying x = 19
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