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Simplifying 7x + 5x + 18 = 90 Reorder the terms: 18 + 7x + 5x = 90 Combine like terms: 7x + 5x = 12x 18 + 12x = 90 Solving 18 + 12x = 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 + 12x = 90 + -18 Combine like terms: 18 + -18 = 0 0 + 12x = 90 + -18 12x = 90 + -18 Combine like terms: 90 + -18 = 72 12x = 72 Divide each side by '12'. x = 6 Simplifying x = 6
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