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y in (-oo:+oo)
8*(3-((11*y)/7))+y = 15 // - 15
8*(3-((11*y)/7))+y-15 = 0
8*((-11/7)*y+3)+y-15 = 0
8*(3-11/7*y)+y-15 = 0
8*(3-11/7*y)+y-15 = 0
24-81/7*y-15 = 0
9-81/7*y = 0
9-81/7*y = 0
9-81/7*y = 0 // - 9
-81/7*y = -9 // : -81/7
y = -9/(-81/7)
y = 7/9
y = 7/9
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