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(1/5)*(7*y-1)+(1/8)*(3*y+7) = 0
1/5*(7*y-1)+1/8*(3*y+7) = 0
1/5*(7*y-1)+1/8*(3*y+7) = 0
71/40*y+27/40 = 0
71/40*y+27/40 = 0
71/40*y+27/40 = 0 // - 27/40
71/40*y = -27/40 // : 71/40
y = -27/40/71/40
y = -27/71
y = -27/71
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