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y in (-oo:+oo)
(-7/9)*y = -9 // + 9
(-7/9)*y+9 = 0
9-7/9*y = 0 // - 9
-7/9*y = -9 // : -7/9
y = -9/(-7/9)
y = 81/7
y = 81/7
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