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(1/5)*(6*y-4)+(1/15)*(12*y+16) = 0
1/5*(6*y-4)+1/15*(12*y+16) = 0
1/5*(6*y-4)+1/15*(12*y+16) = 0
2*y+4/15 = 0
2*y+4/15 = 0
2*y+4/15 = 0 // - 4/15
2*y = -4/15 // : 2
y = -4/15/2
y = -2/15
y = -2/15
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