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Simplifying (3x + 12) + (9x + -4) = 90 Reorder the terms: (12 + 3x) + (9x + -4) = 90 Remove parenthesis around (12 + 3x) 12 + 3x + (9x + -4) = 90 Reorder the terms: 12 + 3x + (-4 + 9x) = 90 Remove parenthesis around (-4 + 9x) 12 + 3x + -4 + 9x = 90 Reorder the terms: 12 + -4 + 3x + 9x = 90 Combine like terms: 12 + -4 = 8 8 + 3x + 9x = 90 Combine like terms: 3x + 9x = 12x 8 + 12x = 90 Solving 8 + 12x = 90 Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-8' to each side of the equation. 8 + -8 + 12x = 90 + -8 Combine like terms: 8 + -8 = 0 0 + 12x = 90 + -8 12x = 90 + -8 Combine like terms: 90 + -8 = 82 12x = 82 Divide each side by '12'. x = 6.833333333 Simplifying x = 6.833333333
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