1/x+1+1/x+2=18/9x+13
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[(x + 2) + (x + 1)]/(x + 2)(x + 1) = 18/(9x + 13)
2x + 3 /(x² + 3x + 2) = 18/(9x + 13)
(18x² + 53x + 39) = 18x² + 54x + 36
x = 3
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