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Simplifying 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 = -2 2x = -2 Divide each side by '2'. x = -1 Simplifying x = -1
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