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y in (-oo:+oo)
(2/7)*y = -10/77 // + -10/77
(2/7)*y-(-10/77) = 0
(2/7)*y+10/77 = 0
2/7*y+10/77 = 0 // - 10/77
2/7*y = -10/77 // : 2/7
y = -10/77/2/7
y = -5/11
y = -5/11
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