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y in (-oo:+oo)
(5*y)/7-15 = 5*y+45 // - 5*y+45
(5*y)/7-(5*y)-45-15 = 0
(5*y)/7-5*y-45-15 = 0
-30/7*y-60 = 0 // + 60
-30/7*y = 60 // : -30/7
y = 60/(-30/7)
y = -14
y = -14
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