Johnny bought for 28 CZK flower to mum. He that spent 4/7 of the money saved. How much money he had saved? How much money left him?

Correct result:

x =  49
x =  21


28 = 4/7 x
y = x-28

28 = 4/7•x
y = x-28

4x = 196
x-y = 28

x = 49
y = 21

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