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1 2 + 3 = 12 4 + 2 + = 43 0 + 2 = 3
3
4 = 3 + 2
1
5 x = 1 + 2y 3z
4 5
= 1 + 2 3 + 2 3 = 1 + 6 + 4 3 = + 7
6 = + 7
4 6 2
4 + 28 + 6 + 4 + = 4 9 = 30 =30
9
4
= 3 20
3
9
3
20
3 =
11
3
& 5
= 1 22
3+
30
3 =
3
3
22
3+
30
3 =
11
3
, &
=
11
3 ; y =
11
3 ; =
10
3