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a in (-oo:+oo)
0.75 = a+5/21 // - a+5/21
0.75-a-(5/21) = 0
0.75-a-5/21 = 0
0.51190476-a = 0 // - 0.51190476
-a = -0.51190476 // * -1
a = 0.51190476
a = 0.51190476
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