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