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Simplifying 13x + 7 + 7x + 3 = 90 Reorder the terms: 7 + 3 + 13x + 7x = 90 Combine like terms: 7 + 3 = 10 10 + 13x + 7x = 90 Combine like terms: 13x + 7x = 20x 10 + 20x = 90 Solving 10 + 20x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 20x = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 20x = 90 + -10 20x = 90 + -10 Combine like terms: 90 + -10 = 80 20x = 80 Divide each side by '20'. x = 4 Simplifying x = 4
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