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a in (-oo:+oo)
a/2+2/9 = (9*a)/4+4/3 // - (9*a)/4+4/3
a/2-((9*a)/4)+2/9-(4/3) = 0
a/2+(-9/4)*a+2/9-4/3 = 0
-7/4*a-10/9 = 0 // + 10/9
-7/4*a = 10/9 // : -7/4
a = 10/9/(-7/4)
a = -40/63
a = -40/63
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