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y in (-oo:+oo)
(-8/45)*y = -16/35 // + -16/35
(-8/45)*y-(-16/35) = 0
(-8/45)*y+16/35 = 0
16/35-8/45*y = 0 // - 16/35
-8/45*y = -16/35 // : -8/45
y = -16/35/(-8/45)
y = 18/7
y = 18/7
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