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a in (-oo:+oo)
a/4-(5/6) = -1/2 // + -1/2
a/4-(5/6)-(-1/2) = 0
a/4-5/6+1/2 = 0
1/4*a-1/3 = 0 // + 1/3
1/4*a = 1/3 // : 1/4
a = 1/3/1/4
a = 4/3
a = 4/3
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