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y in (-oo:+oo)
(5/7)*y-15 = 5*y+30 // - 5*y+30
(5/7)*y-(5*y)-30-15 = 0
(5/7)*y-5*y-30-15 = 0
-30/7*y-45 = 0 // + 45
-30/7*y = 45 // : -30/7
y = 45/(-30/7)
y = -21/2
y = -21/2
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