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a in (-oo:+oo)
(1/10)*(a-6) = (2/5)*(a+1)-((1/5)*a) // - (2/5)*(a+1)-((1/5)*a)
(1/10)*(a-6)-((2/5)*(a+1))+(1/5)*a = 0
(1/10)*(a-6)+(-2/5)*(a+1)+(1/5)*a = 0
1/10*(a-6)-2/5*(a+1)+a/5 = 0
(1/10*5*(a-6))/5+(-2/5*5*(a+1))/5+a/5 = 0
1/10*5*(a-6)-2/5*5*(a+1)+a = 0
a-3/2*a-5 = 0
-1/2*a-5 = 0
(-1/2*a-5)/5 = 0
(-1/2*a-5)/5 = 0 // * 5
-1/2*a-5 = 0
-1/2*a-5 = 0 // + 5
-1/2*a = 5 // : -1/2
a = 5/(-1/2)
a = -10
a = -10
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