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Simplifying 8x + -1 = x + 20 Reorder the terms: -1 + 8x = x + 20 Reorder the terms: -1 + 8x = 20 + x Solving -1 + 8x = 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. -1 + 8x + -1x = 20 + x + -1x Combine like terms: 8x + -1x = 7x -1 + 7x = 20 + x + -1x Combine like terms: x + -1x = 0 -1 + 7x = 20 + 0 -1 + 7x = 20 Add '1' to each side of the equation. -1 + 1 + 7x = 20 + 1 Combine like terms: -1 + 1 = 0 0 + 7x = 20 + 1 7x = 20 + 1 Combine like terms: 20 + 1 = 21 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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