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Simplifying 3x + 15 + 39 = 90 Reorder the terms: 15 + 39 + 3x = 90 Combine like terms: 15 + 39 = 54 54 + 3x = 90 Solving 54 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-54' to each side of the equation. 54 + -54 + 3x = 90 + -54 Combine like terms: 54 + -54 = 0 0 + 3x = 90 + -54 3x = 90 + -54 Combine like terms: 90 + -54 = 36 3x = 36 Divide each side by '3'. x = 12 Simplifying x = 12
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