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Simplifying (X + -15) + -15 = 90 Reorder the terms: (-15 + X) + -15 = 90 Remove parenthesis around (-15 + X) -15 + X + -15 = 90 Reorder the terms: -15 + -15 + X = 90 Combine like terms: -15 + -15 = -30 -30 + X = 90 Solving -30 + X = 90 Solving for variable 'X'. Move all terms containing X to the left, all other terms to the right. Add '30' to each side of the equation. -30 + 30 + X = 90 + 30 Combine like terms: -30 + 30 = 0 0 + X = 90 + 30 X = 90 + 30 Combine like terms: 90 + 30 = 120 X = 120 Simplifying X = 120
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