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7/9=b/b-10 please help!!
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7/9=b/b-10 please help!!

User ENca
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(7)/(9)=(b)/(b-10)\\\\cross\ multiply\\\\9b=7(b-10)\\9b=7b-70\ \ \ \ |subtract\ 7b\ from\ both\ sides\\2b=-70\ \ \ \ \ \ |divide\ both\ sides\ by\ 2\\\\\boxed{b=-35}
User Sergi Juanola
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