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y in (-oo:+oo)
(7*y)/8 = 35/20 // - 35/20
(7*y)/8-(35/20) = 0
(7*y)/8-7/4 = 0
7/8*y-7/4 = 0 // + 7/4
7/8*y = 7/4 // : 7/8
y = 7/4/7/8
y = 2
y = 2
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