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y in (-oo:+oo)
18 = (9/13)*y+9 // - (9/13)*y+9
18-((9/13)*y)-9 = 0
(-9/13)*y-9+18 = 0
9-9/13*y = 0 // - 9
-9/13*y = -9 // : -9/13
y = -9/(-9/13)
y = 13
y = 13
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