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Simplifying 12x + 4 + 9x + 2 = 90 Reorder the terms: 4 + 2 + 12x + 9x = 90 Combine like terms: 4 + 2 = 6 6 + 12x + 9x = 90 Combine like terms: 12x + 9x = 21x 6 + 21x = 90 Solving 6 + 21x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6' to each side of the equation. 6 + -6 + 21x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 21x = 90 + -6 21x = 90 + -6 Combine like terms: 90 + -6 = 84 21x = 84 Divide each side by '21'. x = 4 Simplifying x = 4
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