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a in (-oo:+oo)
2*a+(1/2)*a+3/4 = 107/36 // - 107/36
2*a+(1/2)*a+3/4-(107/36) = 0
2*a+(1/2)*a+3/4-107/36 = 0
5/2*a-20/9 = 0 // + 20/9
5/2*a = 20/9 // : 5/2
a = 20/9/5/2
a = 8/9
a = 8/9
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