Question 204255
2/x - 3/2y + 3/5x -1/4y 
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lcd = 20xy
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Rewrite each fraction with the lcd as its denominator:
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(40y/lcd) - (30x/lcd) + (12y/lcd) - (5x/lcd)
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Combine the numerators over the lcd:
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[40y - 30x + 12y -5x)/lcd
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Simplify:
(52y - 35x)/(20xy)
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Cheers,
Stan H.