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a in (-oo:+oo)
(6/7)*a+10 = 19/2 // - 19/2
(6/7)*a-(19/2)+10 = 0
(6/7)*a-19/2+10 = 0
6/7*a+1/2 = 0 // - 1/2
6/7*a = -1/2 // : 6/7
a = -1/2/6/7
a = -7/12
a = -7/12
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