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Simplifying 6x + 9 + -3x = 42 Reorder the terms: 9 + 6x + -3x = 42 Combine like terms: 6x + -3x = 3x 9 + 3x = 42 Solving 9 + 3x = 42 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 + 3x = 42 + -9 Combine like terms: 9 + -9 = 0 0 + 3x = 42 + -9 3x = 42 + -9 Combine like terms: 42 + -9 = 33 3x = 33 Divide each side by '3'. x = 11 Simplifying x = 11
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