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y in (-oo:+oo)
(3*(y-7))/5 = -2*y // + -2*y
(3*(y-7))/5-(-2*y) = 0
(3*(y-7))/5+2*y = 0
(3*(y-7))/5+(2*5*y)/5 = 0
3*(y-7)+2*5*y = 0
13*y-21 = 0
(13*y-21)/5 = 0
(13*y-21)/5 = 0 // * 5
13*y-21 = 0
13*y-21 = 0 // + 21
13*y = 21 // : 13
y = 21/13
y = 21/13
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