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y in (-oo:+oo)
(-7/9)*y = 28/36 // - 28/36
(-7/9)*y-(28/36) = 0
(-7/9)*y-7/9 = 0
-7/9*y-7/9 = 0 // + 7/9
-7/9*y = 7/9 // : -7/9
y = 7/9/(-7/9)
y = -1
y = -1
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