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a in (-oo:+oo)
a+(1/2)*a+6 = 33/2 // - 33/2
a+(1/2)*a-(33/2)+6 = 0
a+(1/2)*a-33/2+6 = 0
3/2*a-21/2 = 0 // + 21/2
3/2*a = 21/2 // : 3/2
a = 21/2/3/2
a = 7
a = 7
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