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y in (-oo:+oo)
(7*y-2)/5+(5*y+7)/2 = 7 // - 7
(7*y-2)/5+(5*y+7)/2-7 = 0
(2*(7*y-2))/(2*5)+(5*(5*y+7))/(2*5)+(-7*2*5)/(2*5) = 0
2*(7*y-2)+5*(5*y+7)-7*2*5 = 0
39*y-70+31 = 0
39*y-39 = 0
(39*y-39)/(2*5) = 0
(39*y-39)/(2*5) = 0 // * 2*5
39*y-39 = 0
39*y-39 = 0 // + 39
39*y = 39 // : 39
y = 39/39
y = 1
y = 1
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