7,429x+9,571x=4,25;
x=?

28x-x=0,729;28x−x=0,729;
x=?

1,5x-0,78x=1,8;1,5x−0,78x=1,8;
x=?

3,6y+2,8y=22,4;3,6y+2,8y=22,4;
x=?
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