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