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a) 1/5 de x = 200
(1/5)(x) = 200
x = 200*5
x = 1000
b) 4/9 de x = 80
(4/9)(x) = 200
4x = 200*9
4x = 1800
x = 1800/4
x = 450
c) 3/5 de x = 15
(3/5)(x) = 15
3x = 15*5
3x = 75
x = 75/3
x = 25
d) 3/4 de x = 48
(3/4)(x) = 48
3x = 48*4
3x = 192
x =192/3
x = 64
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