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(25*y)/28-7 = 3-((4*y)/7) // - 3-((4*y)/7)
(25*y)/28+(4*y)/7-7-3 = 0
41/28*y-10 = 0 // + 10
41/28*y = 10 // : 41/28
y = 10/41/28
y = 280/41
y = 280/41
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