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SE MULTIPLICA
1/5-1/10W=4/5-2/5W
-1/10W+2/5W=4/5-3/5
-5W+20W÷50=1/5
15/50W=1/5
3/10W=1/5
15W=10
W=2/3
3/5-1/10w= 4/2-2/5w
10 x 3/5-10 x 1/10 w = 10 x 4/5 - 10 x 2/5 w
2 x 3- w = 2 x 4 - 2 x 2w
6 - w = 8 - 4w
-w+ 4w = 8-6
3w =2
w = 2/3