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Simplifying 90 = 3x + -14 + 2x + 9 Reorder the terms: 90 = -14 + 9 + 3x + 2x Combine like terms: -14 + 9 = -5 90 = -5 + 3x + 2x Combine like terms: 3x + 2x = 5x 90 = -5 + 5x Solving 90 = -5 + 5x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-5x' to each side of the equation. 90 + -5x = -5 + 5x + -5x Combine like terms: 5x + -5x = 0 90 + -5x = -5 + 0 90 + -5x = -5 Add '-90' to each side of the equation. 90 + -90 + -5x = -5 + -90 Combine like terms: 90 + -90 = 0 0 + -5x = -5 + -90 -5x = -5 + -90 Combine like terms: -5 + -90 = -95 -5x = -95 Divide each side by '-5'. x = 19 Simplifying x = 19

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