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Simplifying 2x + x + -15 = 90 Reorder the terms: -15 + 2x + x = 90 Combine like terms: 2x + x = 3x -15 + 3x = 90 Solving -15 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '15' to each side of the equation. -15 + 15 + 3x = 90 + 15 Combine like terms: -15 + 15 = 0 0 + 3x = 90 + 15 3x = 90 + 15 Combine like terms: 90 + 15 = 105 3x = 105 Divide each side by '3'. x = 35 Simplifying x = 35
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