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(4/7)*y+8*(3/4) = 8*(5/4)-1 // - 8*(5/4)-1
(4/7)*y+8*(3/4)-(8*(5/4))+1 = 0
(4/7)*y+8*(3/4)-10+1 = 0
4/7*y-3 = 0 // + 3
4/7*y = 3 // : 4/7
y = 3/4/7
y = 21/4
y = 21/4
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