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a in (-oo:+oo)
4*a+5/6 = 197/6 // - 197/6
4*a+5/6-(197/6) = 0
4*a+5/6-197/6 = 0
4*a-32 = 0 // + 32
4*a = 32 // : 4
a = 32/4
a = 8
a = 8
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