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a in (-oo:+oo)
-((6/7)*a)-7/8 = -97/56 // + -97/56
-((6/7)*a)-7/8-(-97/56) = 0
(-6/7)*a-7/8+97/56 = 0
6/7-6/7*a = 0 // - 6/7
-6/7*a = -6/7 // : -6/7
a = -6/7/(-6/7)
a = 1
a = 1
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