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Simplifying 7x + 13x + 20 = 420 Reorder the terms: 20 + 7x + 13x = 420 Combine like terms: 7x + 13x = 20x 20 + 20x = 420 Solving 20 + 20x = 420 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20' to each side of the equation. 20 + -20 + 20x = 420 + -20 Combine like terms: 20 + -20 = 0 0 + 20x = 420 + -20 20x = 420 + -20 Combine like terms: 420 + -20 = 400 20x = 400 Divide each side by '20'. x = 20 Simplifying x = 20
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