527: а) 4\13+y=1
y=1–4\13
y=9\13
530: a) 7\12+q=1
q=1–7\12
q=5\12
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527: а) 4\13+y=1
y=1–4\13
y=9\13
530: a) 7\12+q=1
q=1–7\12
q=5\12