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a in (-oo:+oo)
18 = 20-a/32 // - 20-a/32
18-(-a/32)-20 = 0
(1/32)*a-20+18 = 0
1/32*a-2 = 0 // + 2
1/32*a = 2 // : 1/32
a = 2/1/32
a = 64
a = 64
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