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Simplifying (5x + 2) + (7x + 4) = 90 Reorder the terms: (2 + 5x) + (7x + 4) = 90 Remove parenthesis around (2 + 5x) 2 + 5x + (7x + 4) = 90 Reorder the terms: 2 + 5x + (4 + 7x) = 90 Remove parenthesis around (4 + 7x) 2 + 5x + 4 + 7x = 90 Reorder the terms: 2 + 4 + 5x + 7x = 90 Combine like terms: 2 + 4 = 6 6 + 5x + 7x = 90 Combine like terms: 5x + 7x = 12x 6 + 12x = 90 Solving 6 + 12x = 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 + 12x = 90 + -6 Combine like terms: 6 + -6 = 0 0 + 12x = 90 + -6 12x = 90 + -6 Combine like terms: 90 + -6 = 84 12x = 84 Divide each side by '12'. x = 7 Simplifying x = 7
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