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Simplifying 3x + 42 + 6x + 9 = 90 Reorder the terms: 42 + 9 + 3x + 6x = 90 Combine like terms: 42 + 9 = 51 51 + 3x + 6x = 90 Combine like terms: 3x + 6x = 9x 51 + 9x = 90 Solving 51 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-51' to each side of the equation. 51 + -51 + 9x = 90 + -51 Combine like terms: 51 + -51 = 0 0 + 9x = 90 + -51 9x = 90 + -51 Combine like terms: 90 + -51 = 39 9x = 39 Divide each side by '9'. x = 4.333333333 Simplifying x = 4.333333333
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