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Simplifying 20 = x + -2(x + 4) Reorder the terms: 20 = x + -2(4 + x) 20 = x + (4 * -2 + x * -2) 20 = x + (-8 + -2x) Reorder the terms: 20 = -8 + x + -2x Combine like terms: x + -2x = -1x 20 = -8 + -1x Solving 20 = -8 + -1x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add 'x' to each side of the equation. 20 + x = -8 + -1x + x Combine like terms: -1x + x = 0 20 + x = -8 + 0 20 + x = -8 Add '-20' to each side of the equation. 20 + -20 + x = -8 + -20 Combine like terms: 20 + -20 = 0 0 + x = -8 + -20 x = -8 + -20 Combine like terms: -8 + -20 = -28 x = -28 Simplifying x = -28
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