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a in (-oo:+oo)
a/6+2 = a+42/42 // - a+42/42
a/6-a-(42/42)+2 = 0
a/6-a-1+2 = 0
1-5/6*a = 0 // - 1
-5/6*a = -1 // : -5/6
a = -1/(-5/6)
a = 6/5
a = 6/5
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