`12/x = -9/20`
`=> -9x = 12.20`
`=> -9x= 240`
`=> x= 240 : (-9)`
`=>x= -80/3`
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Tìm x ϵ Z, biết: dfrac{5}{17}+dfrac{-4}{9}+-dfrac{20}{31}+dfrac{12}{17}+dfrac{-11}{-31} dfrac{x}{9} ≤ dfrac{-3}{7}+dfrac{7}{15}+dfrac{4}{-7}+dfrac{8}{15}+dfrac{2}{3}
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Tìm x ϵ Z, biết:
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