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y in (-oo:+oo)
2-((9*y)/17)-(4*y) = 0
(-9/17)*y-4*y+2 = 0
2-77/17*y = 0 // - 2
-77/17*y = -2 // : -77/17
y = -2/(-77/17)
y = 34/77
y = 34/77
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