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y in (-oo:+oo)
261-y = (1650-(6*y))/9 // - (1650-(6*y))/9
261-((1650-(6*y))/9)-y = 0
261-((1650-6*y)/9)-y = 0
(-1*(1650-6*y))/9-y+261 = 0
(-1*(1650-6*y))/9+(9*(-y))/9+(9*261)/9 = 0
9*(-y)-1*(1650-6*y)+9*261 = 0
2349-3*y-1650 = 0
699-3*y = 0
(699-3*y)/9 = 0
(699-3*y)/9 = 0 // * 9
699-3*y = 0
699-3*y = 0 // - 699
-3*y = -699 // : -3
y = -699/(-3)
y = 233
y = 233
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