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a in (-oo:+oo)
(11/12)*a = (1/12)*a+3/4 // - (1/12)*a+3/4
(11/12)*a-((1/12)*a)-(3/4) = 0
(11/12)*a+(-1/12)*a-3/4 = 0
5/6*a-3/4 = 0 // + 3/4
5/6*a = 3/4 // : 5/6
a = 3/4/5/6
a = 9/10
a = 9/10
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