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Simplifying 20 + x = 2(20 + -2x) 20 + x = (20 * 2 + -2x * 2) 20 + x = (40 + -4x) Solving 20 + x = 40 + -4x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '4x' to each side of the equation. 20 + x + 4x = 40 + -4x + 4x Combine like terms: x + 4x = 5x 20 + 5x = 40 + -4x + 4x Combine like terms: -4x + 4x = 0 20 + 5x = 40 + 0 20 + 5x = 40 Add '-20' to each side of the equation. 20 + -20 + 5x = 40 + -20 Combine like terms: 20 + -20 = 0 0 + 5x = 40 + -20 5x = 40 + -20 Combine like terms: 40 + -20 = 20 5x = 20 Divide each side by '5'. x = 4 Simplifying x = 4
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