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y in (-oo:+oo)
(4/7)*y+6 = 10-1 // - 10-1
(4/7)*y-10+1+6 = 0
4/7*y-3 = 0 // + 3
4/7*y = 3 // : 4/7
y = 3/4/7
y = 21/4
y = 21/4
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