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Simplifying (70 + 20) * x = 400 + 20x Combine like terms: 70 + 20 = 90 (90) * x = 400 + 20x Solving 90x = 400 + 20x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-20x' to each side of the equation. 90x + -20x = 400 + 20x + -20x Combine like terms: 90x + -20x = 70x 70x = 400 + 20x + -20x Combine like terms: 20x + -20x = 0 70x = 400 + 0 70x = 400 Divide each side by '70'. x = 5.714285714 Simplifying x = 5.714285714
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