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Simplifying 4x + 9 + 3x = 90 Reorder the terms: 9 + 4x + 3x = 90 Combine like terms: 4x + 3x = 7x 9 + 7x = 90 Solving 9 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9' to each side of the equation. 9 + -9 + 7x = 90 + -9 Combine like terms: 9 + -9 = 0 0 + 7x = 90 + -9 7x = 90 + -9 Combine like terms: 90 + -9 = 81 7x = 81 Divide each side by '7'. x = 11.57142857 Simplifying x = 11.57142857
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