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a in (-oo:+oo)
2*a-(5/6) = -7/12 // + -7/12
2*a-(5/6)-(-7/12) = 0
2*a-5/6+7/12 = 0
2*a-1/4 = 0 // + 1/4
2*a = 1/4 // : 2
a = 1/4/2
a = 1/8
a = 1/8
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