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a in (-oo:+oo)
23/36 = 2*a-3*a+8/9 // - 2*a-3*a+8/9
23/36-(-3*a)-(2*a)-(8/9) = 0
3*a-2*a+23/36-8/9 = 0
a-1/4 = 0 // + 1/4
a = 1/4
a = 1/4
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