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3a + 1 3/4 = 2 1/5
3a = 2 1/5 - 1 3/4
3a = 2 4/20 - 1 15/20
3a = 9/20 /*1/3
a = 3/20
b)
1 2/3 - 5c = 1 1/4
-5c = 1 1/4 - 1 2/3
-5c = 1 3/12 - 1 8/12
-5c = - 5/12 /:(-5)
c = 5/12 * 1/5
c = 1/12
c)
1/2p : 1 3/4 = 8 /*1 3//4
1/2p = 8 * 1 3/4
1/2p = 8 * 7/4
1/2p = 14 /*2
p = 28
b)
c)