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(4*y)/15-7 = 9-((5*y)/3) // - 9-((5*y)/3)
(4*y)/15+(5*y)/3-9-7 = 0
29/15*y-16 = 0 // + 16
29/15*y = 16 // : 29/15
y = 16/29/15
y = 240/29
y = 240/29
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