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Simplifying 3x + 21 + 4x + 9 = 90 Reorder the terms: 21 + 9 + 3x + 4x = 90 Combine like terms: 21 + 9 = 30 30 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x 30 + 7x = 90 Solving 30 + 7x = 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 + 7x = 90 + -30 Combine like terms: 30 + -30 = 0 0 + 7x = 90 + -30 7x = 90 + -30 Combine like terms: 90 + -30 = 60 7x = 60 Divide each side by '7'. x = 8.571428571 Simplifying x = 8.571428571
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