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y in (-oo:+oo)
(6/7)*y = -2/3 // + -2/3
(6/7)*y-(-2/3) = 0
(6/7)*y+2/3 = 0
6/7*y+2/3 = 0 // - 2/3
6/7*y = -2/3 // : 6/7
y = -2/3/6/7
y = -7/9
y = -7/9
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