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Simplifying (4o + -28) + (o + 13) = 90 Reorder the terms: (-28 + 4o) + (o + 13) = 90 Remove parenthesis around (-28 + 4o) -28 + 4o + (o + 13) = 90 Reorder the terms: -28 + 4o + (13 + o) = 90 Remove parenthesis around (13 + o) -28 + 4o + 13 + o = 90 Reorder the terms: -28 + 13 + 4o + o = 90 Combine like terms: -28 + 13 = -15 -15 + 4o + o = 90 Combine like terms: 4o + o = 5o -15 + 5o = 90 Solving -15 + 5o = 90 Solving for variable 'o'. Move all terms containing o to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 5o = 90 + 15 Combine like terms: -15 + 15 = 0 0 + 5o = 90 + 15 5o = 90 + 15 Combine like terms: 90 + 15 = 105 5o = 105 Divide each side by '5'. o = 21 Simplifying o = 21
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