How many times 5/18 should be added to -5/9 to get the answer 15
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-5/9+x(5/18)=15
-10/18+x(5/18)=270/18
x(5/18)=270/18 - (-10/18)
x(5/18)=270/18+10/18
x(5/18)=280/18
x=280/18 ÷5/18
x=280/18×18/5
x=56
-10/18+x(5/18)=270/18
x(5/18)=270/18 - (-10/18)
x(5/18)=270/18+10/18
x(5/18)=280/18
x=280/18 ÷5/18
x=280/18×18/5
x=56
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