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Simplifying 90 = 11x + 9 + 2x Reorder the terms: 90 = 9 + 11x + 2x Combine like terms: 11x + 2x = 13x 90 = 9 + 13x Solving 90 = 9 + 13x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-13x' to each side of the equation. 90 + -13x = 9 + 13x + -13x Combine like terms: 13x + -13x = 0 90 + -13x = 9 + 0 90 + -13x = 9 Add '-90' to each side of the equation. 90 + -90 + -13x = 9 + -90 Combine like terms: 90 + -90 = 0 0 + -13x = 9 + -90 -13x = 9 + -90 Combine like terms: 9 + -90 = -81 -13x = -81 Divide each side by '-13'. x = 6.230769231 Simplifying x = 6.230769231
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