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Simplifying 2(2 * 5 + 2x + 5x) = 420 Multiply 2 * 5 2(10 + 2x + 5x) = 420 Combine like terms: 2x + 5x = 7x 2(10 + 7x) = 420 (10 * 2 + 7x * 2) = 420 (20 + 14x) = 420 Solving 20 + 14x = 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 + 14x = 420 + -20 Combine like terms: 20 + -20 = 0 0 + 14x = 420 + -20 14x = 420 + -20 Combine like terms: 420 + -20 = 400 14x = 400 Divide each side by '14'. x = 28.57142857 Simplifying x = 28.57142857
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