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(7*y)/30-6 = 1-((6*y)/5) // - 1-((6*y)/5)
(7*y)/30+(6*y)/5-6-1 = 0
43/30*y-7 = 0 // + 7
43/30*y = 7 // : 43/30
y = 7/43/30
y = 210/43
y = 210/43
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