где у меня ошибка ?
2. Найди а и b
(a – b)÷ (a + b) = 9 and (ab)÷ (a + b) = −60.


(a-b)÷(a+b)=9

a-b=9a+9b

8a+10b=0

4a+5b=0

a=-5b/4

(ab)÷(a+b)=-60

(-5b/4×b)÷(-5b/4+b)=-60

-5b2/4÷(-5b/4+4b/4)=-60

5b2/4÷(-b/4)=-60

5b2/4×(4/-b)=-60

-5b=-60

b=-60÷(-5)

b=12



a=-5b/4


a=-5×12/4

a=-15
проверка:
(ab)÷ (a + b) = −60
(-15×12)÷(-15+12)=-60
-180÷(-3)≠-60
где у меня ошибка ?

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