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Simplifying 20 + x = 2(20 + x) 20 + x = (20 * 2 + x * 2) 20 + x = (40 + 2x) Solving 20 + x = 40 + 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 + x + -2x = 40 + 2x + -2x Combine like terms: x + -2x = -1x 20 + -1x = 40 + 2x + -2x Combine like terms: 2x + -2x = 0 20 + -1x = 40 + 0 20 + -1x = 40 Add '-20' to each side of the equation. 20 + -20 + -1x = 40 + -20 Combine like terms: 20 + -20 = 0 0 + -1x = 40 + -20 -1x = 40 + -20 Combine like terms: 40 + -20 = 20 -1x = 20 Divide each side by '-1'. x = -20 Simplifying x = -20
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