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y in (-oo:+oo)
(8/7)*y-(4/7) = 0
(8/7)*y-4/7 = 0
8/7*y-4/7 = 0 // + 4/7
8/7*y = 4/7 // : 8/7
y = 4/7/8/7
y = 1/2
y = 1/2
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