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    Work: Find the solution of equation 0.6x+90+60 = 1.4(0.4x+90+60) .
    Question type: Equation
    Solution:Original question:

3 5

x

+

90

+

60

=

7 5

(

2 5

x

+

90

+

60

)

Left side of the equation =

3 5

x

+

150

    The equation is transformed into :

3 5

x

+

150

=

7 5

(

2 5

x

+

90

+

60

)

    Remove the bracket on the right of the equation:

Right side of the equation =

7 5

×

2 5

x

+

7 5

×

90

+

7 5

×

60

=

14 25

x

+

126

+

84

=

14 25

x

+

210

    The equation is transformed into :

3 5

x

+

150

=

14 25

x

+

210

    Transposition :

3 5

x

−

14 25

x

=

210

−

150

    Combine the items on the left of the equation:

1 25

x

=

210

−

150

    Combine the items on the right of the equation:

1 25

x

=

60

    The coefficient of the unknown number is reduced to 1 :

x

=

60

÷

1 25

=

60

×

25

    We obtained :

x

=

1500

    This is the solution of the equation.

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