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y in (-oo:+oo)
(1/5)*(13*y-3)+(1/15)*(6*y+16) = 0
1/5*(13*y-3)+1/15*(6*y+16) = 0
1/5*(13*y-3)+1/15*(6*y+16) = 0
3*y+7/15 = 0
3*y+7/15 = 0
3*y+7/15 = 0 // - 7/15
3*y = -7/15 // : 3
y = -7/15/3
y = -7/45
y = -7/45
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