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y in (-oo:+oo)
(4*y+3)/7 = 9 // - 9
(4*y+3)/7-9 = 0
(4*y+3)/7+(-9*7)/7 = 0
4*y-9*7+3 = 0
4*y-60 = 0
(4*y-60)/7 = 0
(4*y-60)/7 = 0 // * 7
4*y-60 = 0
4*y-60 = 0 // + 60
4*y = 60 // : 4
y = 60/4
y = 15
y = 15
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