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y in (-oo:+oo)
(6/7)*y = -18/77 // + -18/77
(6/7)*y-(-18/77) = 0
(6/7)*y+18/77 = 0
6/7*y+18/77 = 0 // - 18/77
6/7*y = -18/77 // : 6/7
y = -18/77/6/7
y = -3/11
y = -3/11
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