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Simplifying 2x + 5x + 15 = 90 Reorder the terms: 15 + 2x + 5x = 90 Combine like terms: 2x + 5x = 7x 15 + 7x = 90 Solving 15 + 7x = 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 + 7x = 90 + -15 Combine like terms: 15 + -15 = 0 0 + 7x = 90 + -15 7x = 90 + -15 Combine like terms: 90 + -15 = 75 7x = 75 Divide each side by '7'. x = 10.71428571 Simplifying x = 10.71428571
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