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a in (-oo:+oo)
7*a-(1/4) = -31/12 // + -31/12
7*a-(1/4)-(-31/12) = 0
7*a-1/4+31/12 = 0
7*a+7/3 = 0 // - 7/3
7*a = -7/3 // : 7
a = -7/3/7
a = -1/3
a = -1/3
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