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(1/7)*y+(3/4)*y = 71/7 // - 71/7
(1/7)*y+(3/4)*y-(71/7) = 0
(1/7)*y+(3/4)*y-71/7 = 0
25/28*y-71/7 = 0 // + 71/7
25/28*y = 71/7 // : 25/28
y = 71/7/25/28
y = 284/25
y = 284/25
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