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Simplifying x2 + 10x + -8 = x2 + 20 Reorder the terms: -8 + 10x + x2 = x2 + 20 Reorder the terms: -8 + 10x + x2 = 20 + x2 Add '-1x2' to each side of the equation. -8 + 10x + x2 + -1x2 = 20 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -8 + 10x + 0 = 20 + x2 + -1x2 -8 + 10x = 20 + x2 + -1x2 Combine like terms: x2 + -1x2 = 0 -8 + 10x = 20 + 0 -8 + 10x = 20 Solving -8 + 10x = 20 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '8' to each side of the equation. -8 + 8 + 10x = 20 + 8 Combine like terms: -8 + 8 = 0 0 + 10x = 20 + 8 10x = 20 + 8 Combine like terms: 20 + 8 = 28 10x = 28 Divide each side by '10'. x = 2.8 Simplifying x = 2.8
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