Найдите корень уравнения и устно проверьте ответ.
а) х+4=9
б) х-3=8
в) х+5=5
г) х-0,2=0,4
д) х-1/2=2 1/2
е) х/2=1
ж) 5:х=5
з) 10:х=2
и) 4х=0
к) 10 1/2х=31 1/2
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