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a in (-oo:+oo)
(6/7)*a+(3/4)*a-1/3 = 113/336 // - 113/336
(6/7)*a+(3/4)*a-1/3-(113/336) = 0
(6/7)*a+(3/4)*a-1/3-113/336 = 0
45/28*a-75/112 = 0 // + 75/112
45/28*a = 75/112 // : 45/28
a = 75/112/45/28
a = 5/12
a = 5/12
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