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Simplifying 13x + 18 + 7x + 12 = 90 Reorder the terms: 18 + 12 + 13x + 7x = 90 Combine like terms: 18 + 12 = 30 30 + 13x + 7x = 90 Combine like terms: 13x + 7x = 20x 30 + 20x = 90 Solving 30 + 20x = 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 + 20x = 90 + -30 Combine like terms: 30 + -30 = 0 0 + 20x = 90 + -30 20x = 90 + -30 Combine like terms: 90 + -30 = 60 20x = 60 Divide each side by '20'. x = 3 Simplifying x = 3
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