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Simplifying 18 + 3x + 21 = 90 Reorder the terms: 18 + 21 + 3x = 90 Combine like terms: 18 + 21 = 39 39 + 3x = 90 Solving 39 + 3x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-39' to each side of the equation. 39 + -39 + 3x = 90 + -39 Combine like terms: 39 + -39 = 0 0 + 3x = 90 + -39 3x = 90 + -39 Combine like terms: 90 + -39 = 51 3x = 51 Divide each side by '3'. x = 17 Simplifying x = 17
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