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Simplifying 3x + 28 + 4x + -1 = 90 Reorder the terms: 28 + -1 + 3x + 4x = 90 Combine like terms: 28 + -1 = 27 27 + 3x + 4x = 90 Combine like terms: 3x + 4x = 7x 27 + 7x = 90 Solving 27 + 7x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-27' to each side of the equation. 27 + -27 + 7x = 90 + -27 Combine like terms: 27 + -27 = 0 0 + 7x = 90 + -27 7x = 90 + -27 Combine like terms: 90 + -27 = 63 7x = 63 Divide each side by '7'. x = 9 Simplifying x = 9
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