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Simplifying (10 + x)(10 + -1x) = 840 Multiply (10 + x) * (10 + -1x) (10(10 + -1x) + x(10 + -1x)) = 840 ((10 * 10 + -1x * 10) + x(10 + -1x)) = 840 ((100 + -10x) + x(10 + -1x)) = 840 (100 + -10x + (10 * x + -1x * x)) = 840 (100 + -10x + (10x + -1x2)) = 840 Combine like terms: -10x + 10x = 0 (100 + 0 + -1x2) = 840 (100 + -1x2) = 840 Solving 100 + -1x2 = 840 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-100' to each side of the equation. 100 + -100 + -1x2 = 840 + -100 Combine like terms: 100 + -100 = 0 0 + -1x2 = 840 + -100 -1x2 = 840 + -100 Combine like terms: 840 + -100 = 740 -1x2 = 740 Divide each side by '-1'. x2 = -740 Simplifying x2 = -740 Reorder the terms: 740 + x2 = -740 + 740 Combine like terms: -740 + 740 = 0 740 + x2 = 0 The solution to this equation could not be determined.
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