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y in (-oo:+oo)
(-3/7)*y = 4/9 // - 4/9
(-3/7)*y-(4/9) = 0
(-3/7)*y-4/9 = 0
-3/7*y-4/9 = 0 // + 4/9
-3/7*y = 4/9 // : -3/7
y = 4/9/(-3/7)
y = -28/27
y = -28/27
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