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y in (-oo:+oo)
(2*(7-y))/5 = -y // + y
(2*(7-y))/5+y = 0
(2*(7-y))/5+(5*y)/5 = 0
2*(7-y)+5*y = 0
3*y+14 = 0
(3*y+14)/5 = 0
(3*y+14)/5 = 0 // * 5
3*y+14 = 0
3*y+14 = 0 // - 14
3*y = -14 // : 3
y = -14/3
y = -14/3
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