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y in (-oo:+oo)
(-7/11)*y = -2/3 // + -2/3
(-7/11)*y-(-2/3) = 0
(-7/11)*y+2/3 = 0
2/3-7/11*y = 0 // - 2/3
-7/11*y = -2/3 // : -7/11
y = -2/3/(-7/11)
y = 22/21
y = 22/21
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