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a in (-oo:+oo)
43/110 = (-3/5)*a+a+1/2 // - (-3/5)*a+a+1/2
43/110-((-3/5)*a)-a-(1/2) = 0
(3/5)*a-a+43/110-1/2 = 0
-2/5*a-6/55 = 0 // + 6/55
-2/5*a = 6/55 // : -2/5
a = 6/55/(-2/5)
a = -3/11
a = -3/11
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