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y in (-oo:+oo)
(5*y-4)/3 = 7 // - 7
(5*y-4)/3-7 = 0
(5*y-4)/3+(-7*3)/3 = 0
5*y-7*3-4 = 0
5*y-25 = 0
(5*y-25)/3 = 0
(5*y-25)/3 = 0 // * 3
5*y-25 = 0
5*y-25 = 0 // + 25
5*y = 25 // : 5
y = 25/5
y = 5
y = 5
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