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a in (-oo:+oo)
(a+24)/28 = 10 // - 10
(a+24)/28-10 = 0
(a+24)/28+(-10*28)/28 = 0
a-10*28+24 = 0
a-256 = 0
(a-256)/28 = 0
(a-256)/28 = 0 // * 28
a-256 = 0
a-256 = 0 // + 256
a = 256
a = 256
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