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y in (-oo:+oo)
(-7/3)*y-8 = 13 // - 13
(-7/3)*y-13-8 = 0
-7/3*y-21 = 0 // + 21
-7/3*y = 21 // : -7/3
y = 21/(-7/3)
y = -9
y = -9
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