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Simplifying 3x + 6x + 18 = 90 Reorder the terms: 18 + 3x + 6x = 90 Combine like terms: 3x + 6x = 9x 18 + 9x = 90 Solving 18 + 9x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-18' to each side of the equation. 18 + -18 + 9x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 9x = 90 + -18 9x = 90 + -18 Combine like terms: 90 + -18 = 72 9x = 72 Divide each side by '9'. x = 8 Simplifying x = 8
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