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a in (-oo:+oo)
1000 = a+e/3-50 // - a+e/3-50
50-a-(e/3)+1000 = 0
1050-a-(e/3) = 0 // - 1050-(e/3)
-a = -(1050-(e/3)) // * -1
a = 1050-(e/3)
a = 1050-(e/3)
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