Overview: 2 questions will be solved this time.Among them
           ☆1 inequalities
           ☆1 equations

[ 1/2Inequality]
    Assignment:Find the solution set of inequality -（x-1） >3 .
    Question type: Inequality
    Solution:
    The inequality can be reduced to 1 inequality：
        -( x - 1 ) >3         (1)

---

    From inequality(1)：
         x < -2

---

    The final solution set is :
         x < -2
[ 2/2 Equation]
    Work: Find the solution of equation 2x+9 = 0 .
    Question type: Equation
    Solution:Original question:

2

x

+

9

=

0

    Transposition :

2

x

=

0

−

9

    Combine the items on the right of the equation:

2

x

=

-

9

    The coefficient of the unknown number is reduced to 1 :

x

=

-

9

÷

2

=

-

9

×

1 2

    We obtained :

x

=

-

9 2

    This is the solution of the equation.

    Convert the result to decimal form :

x

=

- 4.5

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