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Simplifying (7x + -2) + (5x + 8) = 90 Reorder the terms: (-2 + 7x) + (5x + 8) = 90 Remove parenthesis around (-2 + 7x) -2 + 7x + (5x + 8) = 90 Reorder the terms: -2 + 7x + (8 + 5x) = 90 Remove parenthesis around (8 + 5x) -2 + 7x + 8 + 5x = 90 Reorder the terms: -2 + 8 + 7x + 5x = 90 Combine like terms: -2 + 8 = 6 6 + 7x + 5x = 90 Combine like terms: 7x + 5x = 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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