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Simplifying (12x + -14) + 90 = (9x + 20) Reorder the terms: (-14 + 12x) + 90 = (9x + 20) Remove parenthesis around (-14 + 12x) -14 + 12x + 90 = (9x + 20) Reorder the terms: -14 + 90 + 12x = (9x + 20) Combine like terms: -14 + 90 = 76 76 + 12x = (9x + 20) Reorder the terms: 76 + 12x = (20 + 9x) Remove parenthesis around (20 + 9x) 76 + 12x = 20 + 9x Solving 76 + 12x = 20 + 9x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-9x' to each side of the equation. 76 + 12x + -9x = 20 + 9x + -9x Combine like terms: 12x + -9x = 3x 76 + 3x = 20 + 9x + -9x Combine like terms: 9x + -9x = 0 76 + 3x = 20 + 0 76 + 3x = 20 Add '-76' to each side of the equation. 76 + -76 + 3x = 20 + -76 Combine like terms: 76 + -76 = 0 0 + 3x = 20 + -76 3x = 20 + -76 Combine like terms: 20 + -76 = -56 3x = -56 Divide each side by '3'. x = -18.66666667 Simplifying x = -18.66666667
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