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y in (-oo:+oo)
5 = 7*y-(8*y)-(7/3)+7/7 // - 7*y-(8*y)-(7/3)+7/7
8*y-(7*y)+7/3-(7/7)+5 = 0
8*y-7*y+7/3-1+5 = 0
y+19/3 = 0 // - 19/3
y = -19/3
y = -19/3
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