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a in (-oo:+oo)
(-1/2)*a+4/9 = 59/72 // - 59/72
(-1/2)*a+4/9-(59/72) = 0
(-1/2)*a+4/9-59/72 = 0
-1/2*a-3/8 = 0 // + 3/8
-1/2*a = 3/8 // : -1/2
a = 3/8/(-1/2)
a = -3/4
a = -3/4
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