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Simplifying 21(O + -6) = 7O(4 + 9) Reorder the terms: 21(-6 + O) = 7O(4 + 9) (-6 * 21 + O * 21) = 7O(4 + 9) (-126 + 21O) = 7O(4 + 9) Combine like terms: 4 + 9 = 13 -126 + 21O = 7O(13) Reorder the terms for easier multiplication: -126 + 21O = 7 * 13O Multiply 7 * 13 -126 + 21O = 91O Solving -126 + 21O = 91O Solving for variable 'O'. Move all terms containing O to the left, all other terms to the right. Add '-91O' to each side of the equation. -126 + 21O + -91O = 91O + -91O Combine like terms: 21O + -91O = -70O -126 + -70O = 91O + -91O Combine like terms: 91O + -91O = 0 -126 + -70O = 0 Add '126' to each side of the equation. -126 + 126 + -70O = 0 + 126 Combine like terms: -126 + 126 = 0 0 + -70O = 0 + 126 -70O = 0 + 126 Combine like terms: 0 + 126 = 126 -70O = 126 Divide each side by '-70'. O = -1.8 Simplifying O = -1.8
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