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Simplifying (12x + 4) + (9x + 6) = 90 Reorder the terms: (4 + 12x) + (9x + 6) = 90 Remove parenthesis around (4 + 12x) 4 + 12x + (9x + 6) = 90 Reorder the terms: 4 + 12x + (6 + 9x) = 90 Remove parenthesis around (6 + 9x) 4 + 12x + 6 + 9x = 90 Reorder the terms: 4 + 6 + 12x + 9x = 90 Combine like terms: 4 + 6 = 10 10 + 12x + 9x = 90 Combine like terms: 12x + 9x = 21x 10 + 21x = 90 Solving 10 + 21x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-10' to each side of the equation. 10 + -10 + 21x = 90 + -10 Combine like terms: 10 + -10 = 0 0 + 21x = 90 + -10 21x = 90 + -10 Combine like terms: 90 + -10 = 80 21x = 80 Divide each side by '21'. x = 3.80952381 Simplifying x = 3.80952381
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