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a in (-oo:+oo)
(-4/5)*(3*a+4) = -((2*a)/5)-26/5 // + -((2*a)/5)-26/5
(-4/5)*(3*a+4)+(2*a)/5-(-26/5) = 0
(-4/5)*(3*a+4)+(2*a)/5+26/5 = 0
(2*a)/5-4/5*(3*a+4)+26/5 = 0
(-4/5*5*(3*a+4))/5+(2*a)/5+26/5 = 0
2*a-4/5*5*(3*a+4)+26 = 0
26-10*a-16 = 0
10-10*a = 0
(10-10*a)/5 = 0
(10-10*a)/5 = 0 // * 5
10-10*a = 0
10-10*a = 0 // - 10
-10*a = -10 // : -10
a = -10/(-10)
a = 1
a = 1
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