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a in (-oo:+oo)
(1/5)*(15*a-25) = (1/2)*(6*a-10) // - (1/2)*(6*a-10)
(1/5)*(15*a-25)-((1/2)*(6*a-10)) = 0
(1/5)*(15*a-25)+(-1/2)*(6*a-10) = 0
1/5*(15*a-25)-1/2*(6*a-10) = 0
1/5*(15*a-25)-1/2*(6*a-10) = 0
0 = 0
0 = 0
a belongs to the empty set
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