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a in (-oo:+oo)
(-6/7)*a+1 = -23/7 // + -23/7
(-6/7)*a-(-23/7)+1 = 0
(-6/7)*a+23/7+1 = 0
30/7-6/7*a = 0 // - 30/7
-6/7*a = -30/7 // : -6/7
a = -30/7/(-6/7)
a = 5
a = 5
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