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a in (-oo:+oo)
a = 32/4-(2*6)-9+16 // - 32/4-(2*6)-9+16
a+2*6-(32/4)-16+9 = 0
a+2*6-16-8+9 = 0
a-3 = 0 // + 3
a = 3
a = 3
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