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a in (-oo:+oo)
7*a-(2/20) = 32 // - 32
7*a-(2/20)-32 = 0
7*a-1/10-32 = 0
7*a-321/10 = 0 // + 321/10
7*a = 321/10 // : 7
a = 321/10/7
a = 321/70
a = 321/70
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