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a in (-oo:+oo)
-(2*a)-20 = -a-((11/3)*a) // + -a-((11/3)*a)
a-(2*a)+(11/3)*a-20 = 0
a-2*a+(11/3)*a-20 = 0
8/3*a-20 = 0 // + 20
8/3*a = 20 // : 8/3
a = 20/8/3
a = 15/2
a = 15/2
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