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Simplifying 2x + 8(1 + -1x) = 20 + x 2x + (1 * 8 + -1x * 8) = 20 + x 2x + (8 + -8x) = 20 + x Reorder the terms: 8 + 2x + -8x = 20 + x Combine like terms: 2x + -8x = -6x 8 + -6x = 20 + x Solving 8 + -6x = 20 + x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-1x' to each side of the equation. 8 + -6x + -1x = 20 + x + -1x Combine like terms: -6x + -1x = -7x 8 + -7x = 20 + x + -1x Combine like terms: x + -1x = 0 8 + -7x = 20 + 0 8 + -7x = 20 Add '-8' to each side of the equation. 8 + -8 + -7x = 20 + -8 Combine like terms: 8 + -8 = 0 0 + -7x = 20 + -8 -7x = 20 + -8 Combine like terms: 20 + -8 = 12 -7x = 12 Divide each side by '-7'. x = -1.714285714 Simplifying x = -1.714285714
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