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a in (-oo:+oo)
(6/7)*a-6 = -54/7 // + -54/7
(6/7)*a-(-54/7)-6 = 0
(6/7)*a+54/7-6 = 0
6/7*a+12/7 = 0 // - 12/7
6/7*a = -12/7 // : 6/7
a = -12/7/6/7
a = -2
a = -2
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