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a in (-oo:+oo)
(1/4)*a-(12/84) = 0
(1/4)*a-1/7 = 0
1/4*a-1/7 = 0 // + 1/7
1/4*a = 1/7 // : 1/4
a = 1/7/1/4
a = 4/7
a = 4/7
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