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a in (-oo:+oo)
6*(5*a+8) = 108 // - 108
6*(5*a+8)-108 = 0
6*(5*a+8)-108 = 0
30*a-60 = 0
30*a-60 = 0
30*a-60 = 0 // + 60
30*a = 60 // : 30
a = 60/30
a = 2
a = 2
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