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y in (-oo:+oo)
(10/21)*y = 6/7 // - 6/7
(10/21)*y-(6/7) = 0
(10/21)*y-6/7 = 0
10/21*y-6/7 = 0 // + 6/7
10/21*y = 6/7 // : 10/21
y = 6/7/10/21
y = 9/5
y = 9/5
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