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a in (-oo:+oo)
(2/5)*a+1/3 = 1100 // - 1100
(2/5)*a+1/3-1100 = 0
2/5*a-3299/3 = 0 // + 3299/3
2/5*a = 3299/3 // : 2/5
a = 3299/3/2/5
a = 16495/6
a = 16495/6
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