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Simplifying 20 = 2x + -1 Reorder the terms: 20 = -1 + 2x Solving 20 = -1 + 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 = -1 + 2x + -2x Combine like terms: 2x + -2x = 0 20 + -2x = -1 + 0 20 + -2x = -1 Add '-20' to each side of the equation. 20 + -20 + -2x = -1 + -20 Combine like terms: 20 + -20 = 0 0 + -2x = -1 + -20 -2x = -1 + -20 Combine like terms: -1 + -20 = -21 -2x = -21 Divide each side by '-2'. x = 10.5 Simplifying x = 10.5
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