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How to solve the equation 3X4.2X=25.2 in the second volume of the fourth grade?
Solution: get the equation according to the meaning of the question.

3x+4.2x=25.2

(3+4.2)x=25.2

7.2x=25.2

x = 25.2÷ 7.2

x=3.5

That is, the solution of 3x+4.2x=25.2 is x=3.5.

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