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