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a) 2x + 5 ²/3=21/4;
4
55
c)2(x-1)-1-1=1/x-1 / 12x-3---(x-5):
4
5
i) 2 - x - - = 2 ²/x + 2;
5x
1
1-+
28
8 12
x 100
11
30
3
58
-3-
2
x+3
3
x=2=+1-x